diff --git a/2020/day1/day1.py b/2020/day1/day1.py
new file mode 100644
index 0000000..2123615
--- /dev/null
+++ b/2020/day1/day1.py
@@ -0,0 +1,21 @@
+#! /usr/bin/env python3
+from itertools import product
+
+
+def part1(inp):
+    inp = [int(x) for x in inp]
+    result_pairs = [x for x in list(product(inp, inp)) if sum(x) == 2020]
+    print(result_pairs)
+    print(result_pairs[0][0] * result_pairs[0][1])
+
+
+def part2(inp):
+    inp = [int(x) for x in inp]
+    result_pairs = [x for x in list(product(inp, repeat=3)) if sum(x) == 2020]
+    print(result_pairs)
+    print(result_pairs[0][0] * result_pairs[0][1] * result_pairs[0][2])
+
+
+if __name__ == "__main__":
+    with open("input.txt") as f:
+        part2(f.readlines())
diff --git a/2020/day1/input.txt b/2020/day1/input.txt
new file mode 100644
index 0000000..5e3f00a
--- /dev/null
+++ b/2020/day1/input.txt
@@ -0,0 +1,200 @@
+1975
+1446
+1902
+1261
+1783
+1535
+1807
+1606
+1685
+1933
+1930
+1813
+1331
+1986
+1379
+1649
+1342
+1206
+1832
+1464
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+1116
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+2005
+1977
+1691
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+1993
+1426
+1349
+1280
+1775
+849
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+1562
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+559
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+1572
+1949
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+1704
+1515
diff --git a/2020/day10/day10.py b/2020/day10/day10.py
new file mode 100644
index 0000000..d667976
--- /dev/null
+++ b/2020/day10/day10.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+from collections import Counter
+
+
+def part1(adapters):
+    counts = Counter()
+    # 1 for the socket, of 3 for the device
+    for current, next in zip([0] + adapters, adapters + [3]):
+        counts[next - current] += 1
+    return counts[1] * counts[3]
+
+
+def part2(adapters):
+    counts = Counter({0: 1})
+    for jolt in adapters:
+        s = counts[jolt - 1] + counts[jolt - 2] + counts[jolt - 3]
+        counts[jolt] = s
+    return max(counts.values())
+
+
+if __name__ == "__main__":
+    adapters = sorted(int(l.rstrip()) for l in open("input.txt"))
+    print(part1(adapters))
+    print(part2(adapters))
diff --git a/2020/day10/input.txt b/2020/day10/input.txt
new file mode 100644
index 0000000..b8be7cc
--- /dev/null
+++ b/2020/day10/input.txt
@@ -0,0 +1,99 @@
+151
+94
+14
+118
+25
+143
+33
+23
+80
+95
+87
+44
+150
+39
+148
+51
+138
+121
+70
+69
+90
+155
+144
+40
+77
+8
+97
+45
+152
+58
+65
+63
+128
+101
+31
+112
+140
+86
+30
+55
+104
+135
+115
+16
+26
+60
+96
+85
+84
+48
+4
+131
+54
+52
+139
+76
+91
+46
+15
+17
+37
+156
+134
+98
+83
+111
+72
+34
+7
+108
+149
+116
+32
+110
+47
+157
+75
+13
+10
+145
+1
+127
+41
+53
+2
+3
+117
+71
+109
+105
+64
+27
+38
+59
+24
+20
+124
+9
+66
diff --git a/2020/day11/day11.py b/2020/day11/day11.py
new file mode 100644
index 0000000..0ed735c
--- /dev/null
+++ b/2020/day11/day11.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+from rules import part1_rules
+
+
+def main(grid, rules):
+    generation = 0
+    while True:
+        changes, next_grid = step(grid, rules)
+        generation += 1
+        grid = next_grid
+        assert generation < 1000
+        if changes == 0:
+            return next_grid.count("#")
+
+
+def step(grid, rules):
+    changes = 0
+    next_grid = grid[:]
+    for index, cell in enumerate(grid):
+        try:
+            changes += rules[cell](index, grid, next_grid)
+        except KeyError:
+            pass
+    return changes, next_grid
+
+
+if __name__ == "__main__":
+    with open("input.txt") as infile:
+        grid = list("".join(infile.read().splitlines()))
+        print("Part 1 ", main(grid, rules=part1_rules))
+
+    # print("Part 2 ", main(grid, rules={"L": handle_empty_2, "#": handle_occupied_2}))
diff --git a/2020/day11/grid.py b/2020/day11/grid.py
new file mode 100644
index 0000000..ad73118
--- /dev/null
+++ b/2020/day11/grid.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+
+
+class Grid:
+    def __init__(self, inp):
+        lines = inp.read().splitlines()
+        self.cells = list("".join(lines))
+        self.height = len(lines)
+        self.width = len(lines[0])
+
+    def __getitem__(self, key):
+        x, y = key
+        return cells[y * self.width + x]
+
+    def __setitem__(self, key, value):
+        x, y = key
+        cells[y * self.width + x] = value
+
+    def __iter__(self):
+        return self.cells.__iter__()
+
+    def __str__(self):
+        "\n".join(
+            "".join(
+                grid[pos : pos + grid_width]
+                for pos in range(0, self.width, self.height)
+            )
+        )
diff --git a/2020/day11/input.txt b/2020/day11/input.txt
new file mode 100644
index 0000000..514df25
--- /dev/null
+++ b/2020/day11/input.txt
@@ -0,0 +1,97 @@
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+LLLLLLL.LLLLLLLLLLLLLLLLL.LLLLL.LLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLL.LL.LLLLL
+..L..LL.L.L...LL...L.LL.LL....L.L.L.LLL...LL.LL...L...L...LLLLLL.LLL...L.L.LL................LL.L.
+LLLLLLLLLLL.LLL.LLLLLLLLL.LLLLL.LLLLLLLLLLLLL.LLL.LLLLLLLLLL.LLLLLLL.LLLLLLLLLL.LLLL.LLLLLLLLLLLLL
+LLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLL.LLLLLLLLL.LLLLLLLLLLLLL
+LLLLLLL.LLLLL.L.LLL.LLLLLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLL.LLL.LLL.LLLLL.LLLLLLLLLLLLLLLLLLLLLLL
+LLLLLLL.LLLLLLL.LLLLLLLLL.L.LLL.LL.LLLLLLLL.L.LLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLL
+.LL.LLL.LLLLLLL.LLLLLLLLL.LLLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLLLLL.L.LLLLLLLLLLLLLLLLL.LLLLL
+LLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLL.LLLLLLLL.LL.LLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLL
+LLLL.LL.LLLLLLL.LLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLL.LLLLL
+LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLL.LL.LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLL.LLLLL.LLLLLLL.LLLLLLLLL.LLLLL
+LLLLLLL.LLLLLLL..LLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLL.LL.LLLL.LLLLL.LLLLLLLLL.LLLLLLL.LLLLL
\ No newline at end of file
diff --git a/2020/day11/rules.py b/2020/day11/rules.py
new file mode 100644
index 0000000..7fb1e49
--- /dev/null
+++ b/2020/day11/rules.py
@@ -0,0 +1,115 @@
+#!/usr/bin/env python3
+from itertools import count, takewhile
+
+directions = (
+    (-1, -1),
+    (-1, 0),
+    (-1, 1),
+    (0, -1),
+    (0, 1),
+    (1, -1),
+    (1, 0),
+    (1, 1),
+)
+
+grid_width = 98
+grid_height = 97
+
+
+def handle_empty(index, grid, next_grid):
+    """
+    If a seat is empty (L) and there are no occupied seats adjacent to it, the seat becomes occupied.
+    """
+    neighbors = count_neighbors(index, grid)
+    if neighbors == 0:
+        next_grid[index] = "#"
+        return 1
+    return 0
+
+
+def handle_occupied(index, grid, next_grid):
+    """
+    If a seat is occupied (#) and four or more seats adjacent to it are also occupied, the seat becomes empty.
+    """
+    neighbors = count_neighbors(index, grid)
+    if neighbors >= 4:
+        next_grid[index] = "L"
+        return 1
+    return 0
+
+
+def count_neighbors(pos, grid):
+    neighbors = 0
+    x = pos % grid_width
+    y = pos // grid_width
+    for (dx, dy) in directions:
+        xx = x + dx
+        yy = y + dy
+        if not in_bounds((xx, yy)):
+            continue
+
+        if grid[yy * grid_width + xx] == "#":
+            neighbors += 1
+    return neighbors
+
+
+def handle_empty_2(index, grid, next_grid):
+    """
+    If a seat is empty and there are no occupied seat visible in neither direction,
+    the seat becomes occupied
+    """
+    neighbors = 0
+    x = index % grid_width
+    y = index // grid_width
+    for direction in directions:
+        # keep moving in the specified direction, while checking
+        # that we are in bounds of the grid
+        for xx, yy in takewhile(in_bounds, move(x, y, direction)):
+            cell = grid[yy * grid_width + xx]
+            if cell == "#":
+                neighbors += 1
+            elif cell == "L":
+                break  # No occupied seat in that direction, we can break
+
+    if neighbors == 0:
+        next_grid[index] = "#"
+        return 1
+    return 0
+
+
+def handle_occupied_2(index, grid, next_grid):
+    """
+    An occupied seat becomes empty if there are five or more visible occupied
+    seats in either direction.
+    """
+    occupied = 0
+    x = index % grid_width
+    y = index // grid_width
+    for direction in directions:
+        for xx, yy in takewhile(in_bounds, move(x, y, direction)):
+            print(xx, yy)
+            cell = grid[yy * grid_width + xx]
+
+            if cell == "#":
+                occupied += 1
+
+    if occupied >= 5:
+        next_grid[index] = "L"
+        return 1
+    return 0
+
+
+def in_bounds(pos):
+    x, y = pos
+    return 0 <= x < grid_width and 0 <= y < grid_height
+
+
+def move(x, y, direction):
+    pos = x, y
+    while True:
+        yield pos
+        pos = x + direction[0], y + direction[1]
+
+
+part1_rules = {"L": handle_empty, "#": handle_occupied}
+part2_rules = {"L": handle_empty_2, "#": handle_occupied_2}
diff --git a/2020/day14/day14.py b/2020/day14/day14.py
new file mode 100644
index 0000000..d8fa532
--- /dev/null
+++ b/2020/day14/day14.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+from collections import defaultdict
+
+
+def part1(infile):
+    memory = defaultdict(int)
+    for line in infile:
+        left, right = line.split("=")
+        if left.startswith("mask"):
+            one_mask = right.translate(right.maketrans("X", "0"))
+            zero_mask = right.translate(right.maketrans("X10", "001"))
+        else:
+            address = int(left.split("[")[1].rstrip("] "))  # mem[42] -> 42
+            value = int(right.rstrip())
+            memory[address] = value & ~int(zero_mask, 2) | int(one_mask, 2)
+
+    return sum(memory.values())
+
+
+def part2(infile):
+    memory = defaultdict(int)
+    for line in infile:
+        left, right = line.split(" = ")
+        if left.startswith("mask"):
+            mask = right.rstrip()
+        else:
+            value = right.rstrip()
+            address = apply_mask(left.split("[")[1].rstrip("] "), mask)
+            for addr in generate_floating_addresses(address):
+                memory[int(addr, 2)] = int(value)
+    return sum(memory.values())
+
+
+def apply_mask(address, mask):
+    address = bin(int(address)).lstrip("0b")
+    address = address.zfill(36)
+    for index, bit in enumerate(mask):
+        if bit == "1":
+            address = address[:index] + "1" + address[index + 1 :]
+        elif bit == "X":
+            address = address[:index] + "X" + address[index + 1 :]
+    return address
+
+
+def generate_floating_addresses(address):
+    index = address.find("X")
+    if index == -1:
+        return [address]
+    a1 = generate_floating_addresses(address[:index] + "0" + address[index + 1 :])
+    a2 = generate_floating_addresses(address[:index] + "1" + address[index + 1 :])
+    return a1 + a2
+
+
+if __name__ == "__main__":
+    with open("input.txt") as infile:
+        print(part1(infile))
+        infile.seek(0)
+        print(part2(infile))
diff --git a/2020/day14/input.txt b/2020/day14/input.txt
new file mode 100644
index 0000000..2cb4dc2
--- /dev/null
+++ b/2020/day14/input.txt
@@ -0,0 +1,564 @@
+mask = 1000XX0X0X0X0011XX11110110X101101X01
+mem[17353] = 91550
+mem[3346] = 113780395
+mem[25928] = 15887
+mask = 1100X110000111X1X010X101X01110110X01
+mem[22673] = 365674634
+mem[56387] = 707
+mem[59272] = 66101
+mask = 00110000X1011011111X1X100X1001111000
+mem[26721] = 1906961
+mem[6434] = 1547
+mem[38772] = 3670902
+mask = 1X0110X001101011X011000011000010X100
+mem[14129] = 9885418
+mem[16579] = 19578559
+mem[17948] = 222711
+mem[39312] = 3696
+mem[28037] = 4392
+mask = 1XX01010010100101010X10X0X100X110X0X
+mem[27174] = 34330
+mem[38975] = 1673
+mem[53860] = 43706522
+mem[24314] = 129
+mem[46690] = 2122756
+mem[51409] = 300
+mask = X0X00100X110101XX1110000001000X01101
+mem[16769] = 6839
+mem[4773] = 197670
+mem[16306] = 9387
+mem[23109] = 18936748
+mask = X001X00001111X11X11XX1000001001X1111
+mem[9277] = 2126
+mem[19599] = 2620
+mem[35796] = 1119795
+mem[43013] = 7907629
+mem[34780] = 73089
+mem[43625] = 1251
+mem[45268] = 35981183
+mask = 11X0XX100X01001010101000X000X00X0001
+mem[28057] = 87060
+mem[57943] = 156869
+mem[34328] = 441008
+mem[19172] = 974642
+mem[13455] = 140868162
+mem[10479] = 1478
+mem[3348] = 610
+mask = 1X0011X0000X00X111111X0011001100XX00
+mem[20706] = 371595403
+mem[32191] = 61238
+mem[32541] = 121
+mask = 000101X1X110X01X1010X1XX011XX0110110
+mem[2502] = 3004
+mem[42813] = 50475
+mem[6736] = 218863
+mem[57229] = 542
+mask = X00011110X101011X01100X11011010X100X
+mem[29838] = 6609
+mem[63501] = 76
+mem[35757] = 447
+mem[19646] = 1841
+mem[50155] = 10989663
+mask = 10011000X01110XX1111X10XX00000101001
+mem[16439] = 1250783
+mem[50267] = 12877
+mask = 000X0X011110101X101X010X1X1100X0X1X1
+mem[55873] = 29485206
+mem[3857] = 932873
+mem[53144] = 49937201
+mem[45634] = 3973
+mem[62141] = 84958
+mask = 10001X110XX01011X1100X011010110110XX
+mem[27094] = 64589302
+mem[20130] = 1670
+mem[42036] = 39179827
+mem[31787] = 25295623
+mem[39027] = 1380
+mem[53488] = 593805
+mem[27469] = 6270971
+mask = 0101000001111011101110XXX010X0100010
+mem[34667] = 1338
+mem[2529] = 49045
+mem[40550] = 149
+mem[56292] = 14155
+mask = 1100111X0X0110X11111111010X001001111
+mem[6465] = 8116
+mem[45171] = 158525709
+mem[10613] = 1661122
+mem[37037] = 19153
+mask = 1X0000X1111X1010X1110101100001X10101
+mem[3530] = 361
+mem[15560] = 140278839
+mem[62028] = 12515878
+mem[20628] = 11032
+mem[48912] = 111176
+mem[47515] = 605
+mask = X00111001XX11011X1111X000100X0X0X010
+mem[4615] = 738
+mem[672] = 1477
+mem[16686] = 24069368
+mask = 110011100XX10000X0X00XX0X11100X10111
+mem[12619] = 1252770
+mem[954] = 590503
+mem[16403] = 1087106
+mem[11529] = 24258
+mem[11701] = 160993242
+mem[42676] = 64764346
+mem[7626] = 316
+mask = X001100XXX111X111X1111X000X0X0011100
+mem[42659] = 2822
+mem[40278] = 2173727
+mem[32236] = 13461
+mem[8739] = 49532769
+mem[23981] = 6272019
+mem[26083] = 7424
+mask = 1X001110010X101110111001100X0101XX01
+mem[5207] = 285084
+mem[46863] = 202944
+mem[29623] = 74688785
+mem[39251] = 2480123
+mem[21934] = 128729
+mem[17298] = 74932253
+mem[3243] = 2421447
+mask = 100001000X11100X1X110010XX1010XX010X
+mem[45668] = 70363
+mem[5250] = 19909279
+mem[20889] = 8027
+mem[61368] = 422881
+mask = 1010110X0X111X1111110000X01100XX010X
+mem[7264] = 4257
+mem[62228] = 4486
+mem[11135] = 31885819
+mem[50978] = 523114
+mem[12827] = 9872
+mask = 10X011010110X011001X11001X1100X11101
+mem[15425] = 38832030
+mem[7190] = 3685311
+mem[4442] = 111088
+mem[46774] = 679
+mem[48679] = 30399
+mask = 101100X111011111X1111100X1X100001001
+mem[21055] = 143042
+mem[44782] = 112377326
+mem[62184] = 8230
+mem[49662] = 512539
+mem[26324] = 73321
+mem[17454] = 107773
+mem[63437] = 73219244
+mask = 10000111011110111X1000XX1010X1X0X111
+mem[36342] = 1818
+mem[18094] = 47648232
+mem[52003] = 776369
+mask = 11001X100XX0X01111111XX0110111X00110
+mem[29103] = 5339928
+mem[36458] = 988421275
+mem[749] = 185734229
+mem[33969] = 29427002
+mask = 10X1X0X111X11XX11X11110011XX00011100
+mem[18473] = 197816
+mem[140] = 1537228
+mem[5706] = 1016744730
+mem[21968] = 425238881
+mem[2299] = 7217883
+mem[36197] = 66
+mask = 100110X10X11X011111111X100110X110X00
+mem[5148] = 3669
+mem[50092] = 313576115
+mem[1719] = 23750788
+mem[62734] = 2882
+mem[49010] = 14217157
+mask = 1X0XXX00011X10111X1110000011101X0X1X
+mem[24047] = 11171624
+mem[34404] = 251169353
+mem[23056] = 3568348
+mem[2599] = 9449217
+mask = 0X0X11X1011010111X101X00X111X0001100
+mem[49530] = 1917
+mem[23017] = 4137
+mem[42892] = 209824
+mem[44196] = 2282
+mem[340] = 416390430
+mem[40836] = 4717162
+mask = 1101X000XX1010111011XX1X0000100X0000
+mem[20534] = 116
+mem[51190] = 846413
+mem[43522] = 88862477
+mem[56757] = 7097
+mask = 00000101111XX01110X0X00000111000110X
+mem[20975] = 25703
+mem[11316] = 7721
+mem[56239] = 29785
+mem[51862] = 145224773
+mem[3358] = 10907
+mem[13070] = 77929
+mask = 0X0011110110X0111X1XX11001100X0X11XX
+mem[22991] = 231
+mem[33217] = 2826
+mem[34404] = 509
+mask = 100X11X00000X0X11111000XX000X01010X0
+mem[18012] = 4386
+mem[56514] = 16103818
+mem[46863] = 7016934
+mem[53389] = 2025015
+mem[5646] = 77832170
+mask = 110011X00001X0X11111X100X0000100X01X
+mem[38058] = 327471
+mem[7489] = 247743521
+mem[41341] = 980157
+mask = 10X01XX000X1001X1111X000X101000111X1
+mem[2278] = 1003775
+mem[4957] = 695497071
+mem[27026] = 83380
+mem[58747] = 3055795
+mem[35663] = 424302
+mem[55675] = 1400
+mem[59995] = 15450
+mask = 0X011001001X1X1X10110100011011001011
+mem[18012] = 105413272
+mem[18353] = 2478
+mem[10658] = 33943560
+mem[64129] = 97108
+mem[16290] = 585316720
+mem[38816] = 26080808
+mask = 100X1X10XXX0101X101X000X00111011011X
+mem[37923] = 340333740
+mem[34920] = 429908705
+mem[955] = 1727757
+mem[65269] = 221055157
+mem[10891] = 523742
+mem[7264] = 21158973
+mask = 10XX1100011X10111X1100X00000X0111111
+mem[61904] = 63495
+mem[57943] = 33076
+mem[20097] = 836033572
+mem[12549] = 55029
+mem[3024] = 3602462
+mask = 110X0000011010X11011X0X0101X10XX000X
+mem[14134] = 1542
+mem[802] = 10323
+mem[51543] = 171365721
+mem[12827] = 3980
+mask = 1000X100011110X1111100X100XXX0X001X1
+mem[8136] = 449831
+mem[1281] = 999072275
+mem[20796] = 332579
+mem[443] = 131455
+mem[12894] = 18123
+mem[50922] = 5177801
+mask = 100XXX0001101011X1110X000001101011XX
+mem[18244] = 930
+mem[672] = 89370
+mem[42478] = 50196
+mem[35527] = 16
+mem[61716] = 105683782
+mask = 1000XX00011010111X110X0X1011101XX110
+mem[6775] = 3861120
+mem[843] = 312
+mem[2688] = 196099
+mem[37141] = 377569
+mem[33497] = 825
+mem[32589] = 1629649
+mask = 10X100011X1X1011X01110XX11X01100X100
+mem[20624] = 315487
+mem[31408] = 72488
+mem[63467] = 13483
+mem[2471] = 177211433
+mem[45598] = 62138
+mem[25301] = 6365509
+mask = 110011X0000111001X110110X00XX00001X0
+mem[42036] = 7869
+mem[55966] = 14443044
+mem[27440] = 100934729
+mem[19003] = 2085
+mem[15653] = 2142716
+mem[23117] = 1021
+mem[45011] = 5295150
+mask = X100101X0000X01111111001110X010X111X
+mem[57308] = 11803
+mem[2240] = 961172
+mask = 100011X0011010111X1XX100101010XXX1X0
+mem[2444] = 243334769
+mem[12549] = 40175975
+mask = X0011001X011111110110XX00X0X00X11011
+mem[24834] = 363054
+mem[32941] = 83666205
+mem[16403] = 444996
+mask = 1100X1100001XXXX101X01001X101000010X
+mem[56757] = 6879
+mem[4442] = 2107238
+mem[25399] = 14684
+mem[38582] = 330023
+mem[59557] = 299
+mem[34404] = 357591660
+mask = 0100X11101100011111XX1X000100011111X
+mem[19990] = 405059382
+mem[50770] = 21723749
+mem[47204] = 310
+mem[55142] = 353841
+mem[31516] = 46662
+mem[59748] = 154981
+mask = 100X111001X010111X110X1X101110X01111
+mem[25989] = 412990662
+mem[44019] = 11063
+mem[5207] = 25633
+mem[23445] = 2402831
+mem[30252] = 60933
+mask = 100X111001001X10X0100XXX0011011X10X0
+mem[45485] = 5697187
+mem[39779] = 21767171
+mem[34966] = 498
+mem[13640] = 123685
+mask = X001X00X0XX11X1111111001X111X11111X0
+mem[30646] = 77071
+mem[40278] = 15164
+mem[48949] = 2547
+mem[49010] = 168697055
+mem[52212] = 836232
+mask = X00011000111101111X100X100100X00XX1X
+mem[13958] = 872
+mem[28057] = 130528
+mem[9891] = 1464
+mask = 00X10000000X11111111X0100X1X0X111111
+mem[29510] = 29331
+mem[16403] = 265384902
+mem[46270] = 55500
+mem[35558] = 149875
+mem[42316] = 8508705
+mem[12894] = 281336
+mask = 10X011XX01X00011001110X11111X00X1XX0
+mem[15463] = 114059
+mem[64253] = 5760
+mem[34294] = 38569
+mem[1677] = 5097
+mem[22991] = 502
+mem[44522] = 326097
+mem[8172] = 37
+mask = 00010000X0001X1111111011011101X1X110
+mem[39779] = 1142
+mem[29838] = 85552455
+mem[42813] = 5712091
+mem[45115] = 58778
+mem[13319] = 855
+mem[2440] = 410159
+mask = X101101101X01111101010X110X110000010
+mem[41886] = 1753
+mem[57501] = 961519277
+mem[48943] = 1352369
+mask = 1000011X01111X1111101XX0000X101XX110
+mem[840] = 954719
+mem[53875] = 11370
+mem[45011] = 5033013
+mem[45230] = 850083
+mem[20455] = 862
+mask = 1X00010XX111101X111110000X111011X1X0
+mem[34148] = 99301330
+mem[26648] = 7719906
+mem[18244] = 110630512
+mask = 1100X11000X11X0X1111100X0X00X010XX11
+mem[50401] = 1733252
+mem[26875] = 37568501
+mem[35663] = 508001
+mem[14749] = 1838
+mask = X1010XX001111011101X0000X001XX100010
+mem[63359] = 5414799
+mem[35329] = 251023948
+mem[26907] = 876247525
+mask = X000X0X1111XX0100111XX10101X011X1100
+mem[23165] = 20505666
+mem[7340] = 1068126
+mem[5630] = 2429
+mem[55672] = 30150
+mask = 1000X11X011X101111101X0XX0101X1010X0
+mem[19212] = 6837122
+mem[14758] = 38425
+mem[19003] = 119768
+mask = 10000X01111110X0X1111110XXX110011X10
+mem[33194] = 61265858
+mem[13147] = 3274970
+mem[41650] = 4162
+mem[42478] = 1225726
+mem[63031] = 112464577
+mask = X0X10000X101101111110011X11101111100
+mem[35647] = 5788908
+mem[42040] = 48997
+mem[62673] = 1901
+mem[39850] = 1010636
+mask = 11X010X0010100101X1XXX0001001111010X
+mem[20116] = 50
+mem[57943] = 17495168
+mem[28763] = 19897421
+mem[21657] = 923815
+mem[4802] = 86976237
+mask = 1X0011X001100011XX1X100X101110100110
+mem[13898] = 4734170
+mem[1595] = 82201
+mask = 1001X0010011X111111X1X0X1X1100011000
+mem[44782] = 14922
+mem[54309] = 1336
+mem[23027] = 194803
+mem[24035] = 29316023
+mask = 1100111000010101X011X00011100X00010X
+mem[50916] = 1751
+mem[47305] = 2707
+mem[14464] = 13519228
+mem[33044] = 10744
+mem[53730] = 4920479
+mem[37037] = 859
+mask = X100111X0X10001111111100X11110001110
+mem[58049] = 939221
+mem[1924] = 17
+mem[61135] = 358315072
+mem[21809] = 5281
+mem[39141] = 1817
+mem[51543] = 136115569
+mem[50155] = 300797
+mask = 110010X000X1110010X100X0111X001X00XX
+mem[50279] = 14014916
+mem[12124] = 68328623
+mem[44199] = 313076
+mem[64321] = 4725
+mem[20842] = 108600115
+mem[37411] = 4492927
+mask = X1001X11000010111111XX0X100X11000011
+mem[28505] = 8712
+mem[37967] = 35824634
+mem[23027] = 241
+mem[17252] = 20614619
+mem[24389] = 10076
+mask = X101000001X01011X011X0X10X1100101X10
+mem[61716] = 8801
+mem[34944] = 1881
+mem[4710] = 8504
+mem[56313] = 14501
+mem[5654] = 14055781
+mem[22490] = 90967
+mask = X0X1110X01101011111101001100001X1101
+mem[21158] = 463323
+mem[18946] = 15357
+mem[57000] = 2534149
+mem[15029] = 194259123
+mem[38305] = 441356
+mask = 11001110010X000X101000XX010000111111
+mem[53389] = 1383160
+mem[938] = 1952336
+mem[64009] = 15833
+mask = 00X11X0011X11011111111000X10001X11X1
+mem[6272] = 13767595
+mem[54734] = 510
+mem[33438] = 1925
+mem[36878] = 260095
+mask = 110X11100111X0001X000001011001X01011
+mem[47847] = 2621
+mem[49530] = 526
+mem[17284] = 1326861
+mem[17082] = 5186894
+mem[18302] = 13617528
+mem[7269] = 1111687
+mask = 110011100001X11X101X1X101010X01X0100
+mem[60461] = 2942
+mem[35460] = 327
+mem[28055] = 375226
+mask = 0011111X01101111111010XXX101X101100X
+mem[41886] = 113214
+mem[17284] = 85512736
+mask = 0X01X111X1101X1110100101011110011XX1
+mem[40617] = 603263
+mem[10573] = 33216107
+mem[22356] = 26505
+mem[6272] = 45384662
+mask = 10101X0001111011X11X000111X1X1100X0X
+mem[7936] = 47932
+mem[16185] = 5024
+mem[52003] = 1045816
+mask = 0XXX1X1101101X111X1001X000110001110X
+mem[32145] = 91132
+mem[55966] = 3856425
+mem[42185] = 24094
+mem[36708] = 277
+mask = 1101100XX11X1011111110X0100X10X0000X
+mem[31516] = 5220059
+mem[35747] = 2317
+mem[7864] = 3365
+mem[55570] = 45702
+mask = 110110010X1110X1X111000X0000101X1X00
+mem[44696] = 47285061
+mem[28866] = 23561
+mem[56107] = 8116244
+mem[41437] = 2106148
+mask = 110011X00011001111XX100X11001010010X
+mem[45954] = 58871
+mem[61135] = 3411
+mem[17541] = 3200218
+mem[38985] = 233678515
+mem[41259] = 166543015
+mem[2350] = 34876506
+mask = 11X01X00X0X00001111XX00101X0X0100010
+mem[23027] = 474324
+mem[6434] = 53973
+mem[40128] = 16133
+mem[36404] = 5183
+mask = 1100111000XX00111X11110X11X00X10000X
+mem[10063] = 9539320
+mem[843] = 671
+mem[4773] = 140929
+mem[19139] = 133212046
+mem[20975] = 795877
+mask = 100X0X00011X101111X101000010X0001000
+mem[932] = 2504742
+mem[25530] = 1425628
+mask = 10X001X00X1X1X011X1100110X1X1011X000
+mem[8358] = 313827173
+mem[7256] = 1152512
+mem[6697] = 60311
+mem[15728] = 6743
+mem[64009] = 43785
+mem[43325] = 2846
+mask = 100X1X00011X1011111X000000X0X01X1X00
+mem[46292] = 1644
+mem[1988] = 1949
+mem[40476] = 111556
+mask = 100011X0X11XX01110111X001001X010111X
+mem[43625] = 120590
+mem[63878] = 417
+mem[1924] = 4511945
+mem[36404] = 2609999
+mem[8758] = 30953
+mem[896] = 56891660
+mem[37141] = 770
+mask = 100011X001X0X0111X11100000XXX0010X10
+mem[19084] = 9020
+mem[39875] = 31650099
+mask = 10101110011000110011XX11X110011X1010
+mem[13319] = 1038
+mem[46337] = 51363384
+mem[61871] = 3928
+mem[15595] = 224135
+mem[56790] = 39964747
+mem[54731] = 1878594
+mem[53872] = 4678318
+mask = 00X11001001110111011X0X001X111110X11
+mem[39549] = 14142886
+mem[26096] = 7903442
+mem[43322] = 8676
+mem[17353] = 509961
+mem[49320] = 11303
+mask = 1X0100000X00X011X01X011000X0X0111000
+mem[48878] = 209296
+mem[29990] = 394600
+mask = 100000000X10101X11110XX0101011000011
+mem[843] = 542527866
+mem[63601] = 10350671
+mem[9659] = 3514
+mem[33969] = 266
+mem[2863] = 15309
+mask = 10X0X000011X10XX01100101100XX01X0010
+mem[56350] = 2980026
+mem[45422] = 7205
+mem[26310] = 10221
+mem[40386] = 358165
+mem[55012] = 32294336
+mask = X1001X10000111001011X1001011X0010110
+mem[25508] = 86175837
+mem[26087] = 58400593
+mem[48996] = 27712
+mem[3272] = 2146
diff --git a/2020/day15/day15.py b/2020/day15/day15.py
new file mode 100644
index 0000000..69e4fcf
--- /dev/null
+++ b/2020/day15/day15.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+from collections import defaultdict
+from array import array
+
+
+def main(initial_suite, max_iteration):
+    iteration = 1
+    seen = defaultdict(int)
+
+    # init
+    for number in initial_suite:
+        seen[number] = iteration
+        iteration += 1
+
+    current = 0
+    while iteration < max_iteration:
+        last_seen = seen[current]
+        if last_seen == 0:
+            seen[current] = iteration
+            current = 0  # next
+        else:
+            seen[current] = iteration
+            current = iteration - last_seen  # next
+        iteration += 1
+    return current
+
+
+def main_array(initial_suite, max_iteration):
+    iteration = 1
+    seen = array('I', [0] * max_iteration)
+
+    # init
+    for number in initial_suite:
+        seen[number] = iteration
+        iteration += 1
+
+    current = 0
+    while iteration < max_iteration:
+        last_seen = seen[current]
+        if last_seen == 0:
+            seen[current] = iteration
+            current = 0  # next
+        else:
+            seen[current] = iteration
+            current = iteration - last_seen  # next
+        iteration += 1
+    return current
+
+
+
+
+if __name__ == "__main__":
+    inp = [6, 3, 15, 13, 1, 0]
+    # 423 µs ± 53.9 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)
+    print(main(inp, 2020))
+    # 13.6 s ± 2.89 s per loop (mean ± std. dev. of 7 runs, 1 loop each)
+    #print(main(inp, 30000000))
+    print(main_array(inp, 30000000))
diff --git a/2020/day16/bash.exe.stackdump b/2020/day16/bash.exe.stackdump
new file mode 100644
index 0000000..7ae9491
--- /dev/null
+++ b/2020/day16/bash.exe.stackdump
@@ -0,0 +1,16 @@
+Stack trace:
+Frame        Function    Args
+00600000010  001800617BE (00180251890, 0018023DFD1, 00000000058, 000FFFFB770)
+00600000010  001800490FA (00000000000, 00100000000, 00000000000, 00000000001)
+00600000010  00180049132 (00000000000, 00000000000, 00000000058, 0018031F2C0)
+00600000010  0018006D9C9 (0000000000A, 000FFFFC940, 001800458BF, 00000000000)
+00600000010  0018006DB92 (00000000003, 000FFFFC940, 001800458BF, 000FFFFC940)
+00600000010  0018006EA4C (000FFFFC940, 001802405E5, 001800EAF57, 0000000000D)
+00600000010  001800596A6 (000FFFF0000, 00000000000, 00000000000, 773CE092FFFFFFFF)
+00600000010  0018005A9C5 (00000000002, 0018031EBD0, 001800BE5F9, 00600040000)
+00600000010  0018005AE89 (001800C7664, 00000000000, 00000000000, 00000000000)
+000FFFFCCE0  0018005B149 (000FFFFCE00, 00000000000, 00000000030, 0000000002F)
+000FFFFCCE0  00180049877 (00000000000, 00000000000, 00000000000, 00000000000)
+000FFFFFFF0  001800482C6 (00000000000, 00000000000, 00000000000, 00000000000)
+000FFFFFFF0  00180048374 (00000000000, 00000000000, 00000000000, 00000000000)
+End of stack trace
diff --git a/2020/day16/day16.py b/2020/day16/day16.py
new file mode 100644
index 0000000..bebb6e0
--- /dev/null
+++ b/2020/day16/day16.py
@@ -0,0 +1,105 @@
+# /usr/bin/env python3
+import re
+from collections import defaultdict
+
+"""
+identify invalid nearby tickets by considering only whether tickets contain values that are not valid for any field.
+"""
+
+
+def main():
+    rules, my_ticket, other_tickets = open("input.txt").read().split("\n\n")
+    rules = parse_fields(rules)
+    my_ticket = my_ticket.splitlines()[1]
+    other_tickets = other_tickets.splitlines()[1:]
+    print("Ticket scanning error rate ", part1(other_tickets, rules))
+    part2(my_ticket, other_tickets, rules)
+
+
+def parse_fields(fields):
+    fields_dict = {}
+    for field in fields.splitlines():
+        k, v = field.split(": ")
+        ranges = re.findall(r"(\d+)-(\d+)", v)
+        fields_dict[k] = [range(int(r[0]), int(r[1]) + 1) for r in ranges]
+    return fields_dict
+
+
+def part1(tickets, rules):
+    scanning_error_rate = 0
+    for ticket in tickets:
+        scanning_error_rate += sum(validate_ticket(ticket, rules))
+    return scanning_error_rate
+
+
+def validate_ticket(ticket, rules):
+    invalid_fields = []
+    for value in ticket.split(","):
+        value = int(value)
+        if not validate_field(value, *rules.values()):
+            invalid_fields.append(value)
+    return invalid_fields
+
+
+def validate_field(field, *rules):
+    validations = (any(field in r for r in rule) for rule in rules)
+    return any(validations)
+
+
+def part2(my_ticket, other_tickets, rules):
+    # filter only valid tickets
+    valid_tickets = [ticket for ticket in other_tickets if validate_ticket(ticket, rules) == []]
+    valid_tickets.append(my_ticket)  # my ticket is valid
+
+    # possible field for each index of a ticket
+    candidates = defaultdict(set)
+    for index in range(len(rules)):
+        def inner():
+            for rule_name, constraints in rules.items():
+                for ticket in valid_tickets:
+                    field_value = int(ticket.split(",")[index])
+                    if not validate_field(field_value, constraints):
+                        return
+                candidates[index].add(rule_name)
+        inner()
+    
+    sorted_candidates = sort_candidates(candidates)
+
+    fields_indexes = {}
+    try:
+        while len(fields_indexes) != len(rules):
+            index, found = sorted_candidates.popitem()
+            found = next(iter(found))
+            fields_indexes[index] = found
+            sorted_candidates = remove_item(sorted_candidates, found)
+    except:
+        pass
+
+    fields_indexes = {k: v for k,v in fields_indexes.items() if v.startswith('departure')}
+
+    total = 1
+    my_ticket = my_ticket.split(',')
+    for index in fields_indexes:
+        total *= int(my_ticket[index])
+    a = 1
+
+
+def sort_candidates(c):
+    return {x: c[x] for x in sorted(c, key=lambda k: len(c[k]), reverse=True)}
+
+def remove_item(candidates, item):
+    ret = {}
+    for key, value in candidates.items():
+        try:
+            value.remove(item)
+        except ValueError:
+            pass
+        ret[key] = value
+
+    #candidates = {k: set(v - item) for k,v in candidates.items()}
+    return ret
+
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2020/day16/input.txt b/2020/day16/input.txt
new file mode 100644
index 0000000..7f109db
--- /dev/null
+++ b/2020/day16/input.txt
@@ -0,0 +1,260 @@
+departure location: 32-69 or 86-968
+departure station: 27-290 or 301-952
+departure platform: 47-330 or 347-956
+departure track: 46-804 or 826-956
+departure date: 25-302 or 320-959
+departure time: 29-885 or 893-961
+arrival location: 33-643 or 649-963
+arrival station: 29-135 or 151-973
+arrival platform: 50-648 or 674-961
+arrival track: 45-761 or 767-971
+class: 46-703 or 725-951
+duration: 47-244 or 257-957
+price: 49-195 or 209-956
+route: 44-368 or 393-968
+row: 48-778 or 797-954
+seat: 31-421 or 427-964
+train: 42-229 or 245-961
+type: 31-261 or 281-964
+wagon: 36-428 or 445-967
+zone: 30-906 or 923-960
+
+your ticket:
+157,89,103,59,101,181,109,127,67,173,151,97,107,167,61,131,53,163,179,113
+
+nearby tickets:
+463,746,834,524,530,944,558,680,416,986,364,677,850,160,641,99,898,360,860,695
+131,550,365,282,759,549,212,841,933,177,109,407,859,5,560,119,929,178,725,769
+216,726,353,875,585,448,513,866,55,266,696,173,367,684,99,624,561,735,880,347
+775,949,284,404,832,445,4,368,702,492,577,133,930,170,212,642,213,881,616,67
+948,608,525,771,739,732,556,615,843,447,254,605,573,838,399,104,285,568,59,112
+491,225,446,229,585,462,159,898,365,811,538,469,223,364,943,931,860,835,607,864
+414,164,269,604,564,592,608,179,593,397,326,740,774,445,525,215,354,518,446,776
+880,224,616,325,182,619,635,875,580,78,499,699,225,158,408,119,400,555,514,591
+404,53,154,419,698,67,126,607,519,576,411,51,636,554,856,900,571,133,136,774
+758,87,214,54,193,99,400,544,452,63,481,559,488,897,867,463,426,946,284,189
+489,447,687,643,851,104,172,528,551,694,685,101,772,172,575,100,838,927,992,881
+287,871,570,537,130,290,492,510,163,477,751,273,802,854,624,228,530,591,640,801
+406,830,574,569,627,886,547,850,897,773,362,687,398,359,102,179,904,480,121,553
+110,879,900,570,508,612,944,408,160,505,767,702,645,65,753,588,463,871,403,359
+454,210,123,894,882,285,112,625,936,135,944,88,153,509,852,124,861,997,620,348
+185,302,106,452,607,408,111,875,204,861,769,545,499,460,541,895,329,756,329,929
+510,24,65,939,885,469,175,587,837,516,478,593,321,696,734,525,107,227,459,694
+449,461,195,330,768,501,308,869,747,837,935,109,125,212,212,410,405,358,323,740
+324,834,284,411,181,668,548,904,900,105,112,413,687,499,281,323,624,175,214,595
+222,110,150,626,488,688,185,593,738,409,619,419,351,87,836,172,474,613,539,641
+102,107,614,445,524,414,550,527,556,132,64,767,586,830,226,638,60,900,197,895
+173,508,122,768,479,624,554,177,496,726,536,853,607,640,167,845,415,536,248,859
+507,617,67,881,585,97,132,769,484,245,799,301,101,405,682,936,578,680,87,756
+491,847,160,221,94,832,889,120,576,120,124,756,847,113,169,155,688,217,400,573
+744,524,90,867,548,906,895,867,58,682,326,733,354,168,199,753,729,770,447,480
+282,89,694,575,738,862,879,131,542,539,590,605,697,675,631,301,834,571,765,325
+553,414,732,155,924,108,123,592,321,558,646,624,688,456,51,729,185,193,420,564
+259,454,89,579,475,240,290,90,883,740,88,615,856,348,474,101,486,539,98,413
+620,347,175,930,604,755,662,733,867,157,458,58,367,609,926,545,219,69,545,593
+58,121,126,826,263,218,219,456,691,536,66,193,701,354,564,866,676,182,804,948
+159,860,447,828,361,162,523,544,641,629,869,477,894,102,751,799,396,395,650,846
+200,65,905,393,856,56,874,906,949,412,741,570,56,479,600,541,578,348,734,365
+694,830,665,745,694,590,590,640,111,611,639,770,566,551,258,531,901,585,736,504
+626,219,100,934,573,583,847,949,562,847,739,672,559,585,638,527,771,826,947,131
+471,608,301,588,109,586,209,537,835,136,559,156,829,87,526,610,494,862,580,117
+319,158,288,158,897,100,453,166,194,327,609,756,58,412,213,133,628,518,942,59
+452,468,575,778,577,854,604,59,899,943,697,827,715,609,565,464,576,588,542,483
+676,827,772,460,875,415,587,218,660,577,612,731,697,122,94,502,101,301,195,210
+635,829,732,558,114,804,626,503,408,13,501,882,454,452,108,938,471,834,502,617
+283,53,517,497,628,552,884,194,560,938,552,833,531,278,218,896,618,878,837,118
+76,493,861,123,110,117,680,50,515,776,842,567,549,777,803,459,517,52,563,257
+887,861,214,872,487,582,641,741,636,186,364,563,552,633,630,350,151,902,172,165
+161,478,353,777,361,596,501,879,642,420,456,907,634,826,852,840,505,923,895,192
+905,510,756,415,772,533,153,799,407,571,171,425,117,229,610,631,187,65,850,774
+223,676,134,129,261,211,175,191,411,224,304,544,777,864,53,61,51,900,529,637
+272,747,598,799,458,534,747,591,218,545,571,183,157,946,557,622,126,866,396,591
+108,261,879,156,842,466,285,738,771,595,52,55,463,518,665,750,880,798,778,703
+90,322,517,743,456,911,579,290,923,126,848,868,599,870,628,590,120,544,353,546
+861,477,711,754,420,357,257,880,689,559,748,627,508,171,770,469,223,728,884,414
+60,538,906,571,902,494,284,493,258,745,124,684,94,646,451,90,850,180,175,514
+475,866,326,566,937,975,846,491,456,158,830,403,349,583,557,57,535,883,641,493
+498,580,467,116,614,615,629,161,528,454,81,474,843,640,740,96,848,544,99,530
+526,628,678,725,881,394,742,773,837,762,414,363,211,550,52,106,60,619,61,539
+152,618,802,64,205,828,480,595,898,895,479,527,395,281,95,301,117,357,839,855
+749,760,326,866,176,127,184,610,524,703,365,82,559,68,118,828,558,587,520,170
+905,457,569,641,610,849,226,223,517,740,407,843,905,738,360,115,92,228,59,987
+126,744,503,144,929,684,617,322,220,607,590,584,687,127,941,228,881,415,500,945
+475,495,582,51,57,595,400,217,646,134,50,153,185,212,698,876,228,347,736,604
+518,770,797,608,499,906,702,946,622,173,820,580,564,68,601,774,728,625,894,932
+320,700,588,572,539,470,570,548,556,859,767,284,245,948,411,924,830,935,288,692
+66,497,934,756,122,550,948,692,590,867,104,402,551,766,165,637,405,214,184,288
+363,675,211,426,549,115,321,690,595,566,867,843,883,220,598,54,604,837,483,420
+341,832,534,576,538,760,522,521,176,685,482,472,498,882,697,397,739,947,54,368
+777,469,466,123,111,613,236,846,494,191,218,575,800,611,498,193,364,932,633,188
+865,258,559,516,587,521,678,100,217,517,744,765,499,176,740,826,325,634,357,560
+429,505,736,515,495,702,938,281,152,680,925,193,880,117,494,841,631,110,576,123
+631,942,693,804,610,882,716,228,527,490,135,170,498,675,211,363,229,900,415,400
+62,900,736,564,483,99,512,946,210,209,767,92,833,187,117,412,898,627,749,711
+768,427,536,695,639,730,604,713,470,699,692,555,748,865,216,95,642,630,496,877
+505,626,759,772,151,590,227,505,849,680,551,580,203,223,836,579,754,408,288,168
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diff --git a/2020/day2/input.txt b/2020/day2/input.txt
new file mode 100644
index 0000000..6158f52
--- /dev/null
+++ b/2020/day2/input.txt
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diff --git a/2020/day2/part1.py b/2020/day2/part1.py
new file mode 100644
index 0000000..da33a13
--- /dev/null
+++ b/2020/day2/part1.py
@@ -0,0 +1,28 @@
+#! /usr/bin/env python3
+
+
+def parse_line(line):
+    repeat_range, letter, pwd = line.split(' ')
+    letter = letter[0]
+    repeat_min, repeat_max = repeat_range.split('-')
+    repeat_min, repeat_max = int(repeat_min), int(repeat_max)
+    return letter, range(repeat_min, repeat_max + 1), pwd
+
+
+def test_password(line):
+    letter, repeat_range, pwd = parse_line(line)
+    count = pwd.count(letter)
+    return count in repeat_range
+
+
+def main(inp):
+    with open(inp) as passwds:
+        valid_counter = 0
+        for l in passwds:
+            if test_password(l):
+                valid_counter += 1
+        print(f"Number of  valid password in input : {valid_counter}")
+        
+
+if __name__ == "__main__":
+    main('./input.txt')
diff --git a/2020/day2/part2.py b/2020/day2/part2.py
new file mode 100644
index 0000000..b6fca22
--- /dev/null
+++ b/2020/day2/part2.py
@@ -0,0 +1,32 @@
+#! /usr/bin/env python3
+
+
+def xor(a, b):
+    return (a and not b) or (not a and b)
+
+
+def parse_line(line):
+    repeat_range, letter, pwd = line.split(' ')
+    letter = letter[0]
+    first_pos, second_pos = repeat_range.split('-')
+    first_pos, second_pos = int(first_pos), int(second_pos)
+    return letter, first_pos, second_pos, pwd
+
+
+def test_password(line):
+    letter, first_pos, second_pos, pwd = parse_line(line)
+    return xor(pwd[first_pos - 1] == letter,
+        pwd[second_pos - 1] == letter)
+
+
+def main(inp):
+    with open(inp) as passwds:
+        valid_counter = 0
+        for l in passwds:
+            if test_password(l):
+                valid_counter += 1
+        print(f"Number of  valid password in input : {valid_counter}")
+
+
+if __name__ == "__main__":
+    main('./input.txt')
diff --git a/2020/day3/day3.py b/2020/day3/day3.py
new file mode 100644
index 0000000..c1daf39
--- /dev/null
+++ b/2020/day3/day3.py
@@ -0,0 +1,36 @@
+def check_slope_for_trees(plan, x_right=3, y_down=1):
+    x_max = len(plan[0])
+    y_max = len(plan)
+    
+    x, y = 0, 0
+    tree_count = 0
+    while y < y_max - 1:
+        x += x_right
+        x %= x_max  # wrap x
+        y += y_down
+
+        pos = plan[y][x]
+        if pos == '#':
+            tree_count += 1
+    return tree_count
+
+
+def part1(inp):
+    plan = [line.rstrip() for line in open(inp)]
+    tree_count = check_slope_for_trees(plan)
+    print(f"number of trees : {tree_count}")
+
+
+def part2(inp):
+    plan = [line.rstrip() for line in open(inp)]
+    slopes = [{"x": 1, "y": 1}, {"x": 3, "y": 1}, {"x": 5, "y": 1}, {"x": 7, "y": 1}, {"x": 1, "y": 2}]
+    tree_product = 1
+    for slope in slopes:
+        tree_count = check_slope_for_trees(plan, slope["x"], slope["y"])
+        tree_product *= tree_count
+        print(f"slope {slope} number of trees : {tree_count}")
+        print(f"Cumulative product of tress : {tree_product}")
+
+if __name__ == "__main__":
+    part1('input.txt')
+    part2('input.txt')
diff --git a/2020/day3/input.txt b/2020/day3/input.txt
new file mode 100644
index 0000000..6cfcb73
--- /dev/null
+++ b/2020/day3/input.txt
@@ -0,0 +1,323 @@
+...#...#....#....##...###....#.
+#.#...#...#....#.........#..#..
+.#....##..#.#..##..##..........
+.....#.#.............#..#......
+.......#...#.##.#......#..#.#..
+#.#....#......##........##.....
+.....##.#....#..#...#...##...#.
+...#...#..#.......#..#...##...#
+..........#...........##.......
+..#..#..#...................#..
+#..#....#.....##.#.#..........#
+.#.##.......###.....#.#...#....
+.#..##....##....#.......#...###
+#.#..##...#.#..#...............
+.........#....#.......##.#.#...
+...###...##....##...#..##.#..#.
+....#.........#..#...#.......#.
+....................#..#.#.#...
+..#....#..........#...........#
+.#.....#..#.....##........##..#
+#..##..#...##............#..##.
+.#..##....#..........#..#.##.#.
+..#####..#.#............##.....
+...###.#....##..#.#....#.....#.
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\ No newline at end of file
diff --git a/2020/day4/day4.py b/2020/day4/day4.py
new file mode 100644
index 0000000..519da43
--- /dev/null
+++ b/2020/day4/day4.py
@@ -0,0 +1,47 @@
+#! /usr/bin/env python3
+import re
+
+
+def main(inp):
+    inp = open(inp).read().split('\n\n')
+    valid_passeports = 0
+    for l in inp:
+        l = re.split('[\n\s]', l)
+        passeport = dict(p.split(':') for p in l)
+        if check_passeport(passeport):
+            valid_passeports += 1
+    print("Valid passeports ", valid_passeports)
+
+
+def check_passeport(passeport):
+    fields = [
+        ('byr', lambda v: 1920 <= int(v) <= 2002), # (Birth Year)
+        ('iyr', lambda v: 2010 <= int(v) <= 2020),  # (Issue Year)
+        ('eyr', lambda v: 2020 <= int(v) <= 2030),  # (Expiration Year)
+        ('hgt', validate_height),  # (Height)
+        ('hcl', lambda v: re.search("#[0-9a-f]{6}", v)),  # (Hair Color)
+        ('ecl', lambda v: v in ('amb', 'blu', 'brn', 'gry', 'grn', 'hzl', 'oth')),  # (Eye Color)
+        ('pid', lambda v: len(v) == 9 and v.isdecimal()),  # (Passport ID)
+        #'cid'  # Country id, ignored
+    ]
+    for field, validator in fields:
+            value = passeport.get(field)
+            if value is None:
+                return False
+            elif not validator(value):
+                return False
+    return True
+
+
+def validate_height(v):
+    unit = v[-2:]
+    height = int(v[:-2])
+    if unit == 'cm':
+        return 150 <= height <= 193
+    if unit == 'in':
+        return 59 <= height <= 76
+    return False
+
+
+if __name__ == "__main__":
+    main('input.txt')
diff --git a/2020/day4/input.txt b/2020/day4/input.txt
new file mode 100644
index 0000000..b6e341c
--- /dev/null
+++ b/2020/day4/input.txt
@@ -0,0 +1,1136 @@
+ecl:hzl byr:1926 iyr:2010
+pid:221225902 cid:61 hgt:186cm eyr:2021 hcl:#7d3b0c
+
+hcl:#efcc98 hgt:178 pid:433543520
+eyr:2020 byr:1926
+ecl:blu cid:92
+iyr:2010
+
+iyr:2018
+eyr:2026
+byr:1946 ecl:brn
+hcl:#b6652a hgt:158cm
+pid:822320101
+
+iyr:2010
+hgt:138 ecl:grn pid:21019503 eyr:1937 byr:2008 hcl:z
+
+byr:2018 hcl:z eyr:1990 ecl:#d06796 iyr:2019
+hgt:176in cid:75 pid:153cm
+
+byr:1994
+hcl:#ceb3a1 hgt:176cm cid:80 pid:665071929 eyr:2024 iyr:2020 ecl:grn
+
+cid:280 byr:1955 ecl:blu hgt:155cm hcl:#733820
+eyr:2013 iyr:2011 pid:2346820632
+
+hcl:#4a5917 hgt:61cm
+pid:4772651050
+iyr:2026 ecl:brn byr:2015 eyr:2026
+
+iyr:2019 hcl:#a97842 hgt:182cm eyr:2024 ecl:gry pid:917294399 byr:1974
+
+ecl:#9c635c pid:830491851 hgt:175cm cid:141
+iyr:2010
+hcl:z
+byr:2026 eyr:1998
+
+byr:1927 iyr:2011 pid:055176954 ecl:gry hcl:#7d3b0c eyr:2025 hgt:166cm
+
+hcl:#733820 byr:2008 ecl:utc eyr:1920 pid:159cm hgt:66cm iyr:2030
+
+pid:027609878
+eyr:2022 iyr:2012
+byr:1960 hgt:157cm
+hcl:#b6652a
+cid:117
+ecl:grn
+
+iyr:2025 pid:7190749793 ecl:grn byr:1984 hgt:71in hcl:c41681
+cid:259 eyr:1928
+
+eyr:2029 pid:141655389 cid:52 hcl:#cfa07d iyr:2019
+ecl:blu hgt:69in byr:1938
+
+eyr:2020 hgt:166cm
+ecl:gry
+pid:611660309 iyr:2011
+hcl:#623a2f byr:1943
+
+hgt:190cm eyr:2022 byr:2000 cid:210 pid:728418346 hcl:#a97842 ecl:xry iyr:2015
+
+byr:1973 eyr:2028 iyr:2012
+hcl:#ff0ec8 pid:740554599 ecl:amb cid:58 hgt:155cm
+
+iyr:2016 pid:922938570 ecl:oth hcl:#fffffd hgt:154cm eyr:2021 byr:1966
+
+ecl:amb
+byr:1929
+hcl:#c3bbea pid:511876219
+iyr:2019
+hgt:191cm
+eyr:2026
+
+ecl:utc hgt:155cm pid:#9f0a41 iyr:2012 hcl:#bd4141
+byr:1998 eyr:2020
+
+ecl:grn hgt:173cm cid:321 pid:851120816 byr:1968 hcl:#a97842 eyr:2027
+iyr:2014
+
+hgt:155cm hcl:#f40d77 pid:038224056 byr:1953 ecl:brn iyr:2014
+eyr:2022
+
+pid:181869721
+iyr:2011 hgt:151cm hcl:#733820 cid:110 ecl:blu
+byr:1931 eyr:2024
+
+byr:1948
+hcl:#888785
+hgt:74in
+cid:112 ecl:hzl pid:921761213 eyr:2028
+iyr:2015
+
+ecl:gry
+byr:1931
+pid:600127430 hcl:#341e13 eyr:2027
+iyr:2013 hgt:173cm
+
+hgt:178cm pid:530791289 hcl:#6b5442
+eyr:2022 byr:1979 iyr:2014 ecl:hzl
+
+pid:412193170 hcl:#cfa07d hgt:186cm iyr:2012 cid:284 eyr:2020 byr:1967
+ecl:grn
+
+hcl:#6b5442
+iyr:2015 pid:808448466 ecl:blu eyr:2022 hgt:159cm byr:1969
+
+eyr:2020
+iyr:2019 hgt:170cm pid:8964201562 hcl:#6b5442 byr:1947 ecl:amb
+
+eyr:2029 ecl:hzl hcl:#866857 byr:1961
+iyr:2017
+
+ecl:#3456ba eyr:2013 iyr:2020 pid:378280953
+hcl:z hgt:174cm
+
+hgt:172cm
+cid:202 ecl:oth eyr:2021 byr:1980
+iyr:2012
+hcl:#cfa07d pid:605707698
+
+cid:281 hgt:161cm iyr:2017 pid:122936432 hcl:#602927 byr:1981 ecl:gry eyr:2021
+
+byr:1959 hgt:193cm pid:083900241 iyr:2020 eyr:2037 hcl:#623a2f
+ecl:hzl
+
+iyr:2030 hgt:153cm eyr:2022 hcl:#efcc98 cid:131
+byr:2016 ecl:hzl pid:64053944
+
+hgt:172cm eyr:2025
+hcl:#866857
+byr:1938 ecl:dne
+pid:192cm iyr:2014
+
+pid:016297574 cid:152 iyr:2015
+eyr:2024 hcl:#341e13 byr:1965 hgt:175cm
+ecl:oth
+
+pid:604330171 cid:125 byr:1974 hgt:160cm iyr:2014
+eyr:2022 ecl:oth hcl:#6b5442
+
+pid:59747275
+byr:2027
+hgt:145
+hcl:1fd71f iyr:1944 eyr:2037 ecl:brn
+
+iyr:2010
+eyr:2021 byr:1953
+pid:7098774146 ecl:brn hcl:98737d hgt:158cm
+
+hcl:#602927 eyr:2039 pid:#81a5a1 iyr:2012 cid:67 byr:1951
+ecl:#6551f5 hgt:76cm
+
+hgt:170cm ecl:oth
+cid:235 eyr:2022
+byr:1929 iyr:2019
+hcl:#341e13 pid:797557745
+
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+hcl:#733820
+eyr:2022 pid:830183476 ecl:blu byr:1976 cid:157 hgt:75in
+
+hgt:164cm ecl:amb pid:653425455 hcl:#623a2f byr:1977 eyr:2020
+iyr:2013
+
+byr:2009 eyr:1953 hgt:178cm pid:#5d02f0
+hcl:#a97842 iyr:2016
+ecl:amb
+
+pid:009643210 eyr:2036 ecl:zzz
+cid:97 hcl:32e540 byr:2005 hgt:187cm iyr:2021
+
+pid:155cm
+iyr:2022 byr:2024 eyr:2031 ecl:amb cid:79
+hcl:#cfa07d hgt:69cm
+
+cid:176 ecl:oth
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+iyr:2016 hcl:#888785
+
+hcl:#888785
+eyr:2027
+iyr:2020 pid:802243213 ecl:brn
+hgt:179cm byr:1976
+
+hcl:#6cad3e hgt:164cm byr:1982 iyr:2020
+ecl:gry
+pid:142160687 eyr:2023
+
+hcl:#18171d
+hgt:153cm
+iyr:2014 ecl:hzl cid:231 pid:167809118 byr:1997 eyr:2028
+
+byr:1940
+ecl:hzl iyr:2016 cid:67 hcl:#c800da
+pid:563956960 eyr:2021
+hgt:189cm
+
+pid:133094996 eyr:2032 hgt:60cm hcl:#623a2f byr:2030 ecl:dne iyr:2023
+
+pid:65195409 hcl:d0d492
+iyr:1956
+byr:2019 ecl:#bb043f eyr:2031 hgt:167in
+
+iyr:2016 byr:2006 ecl:#35d62f eyr:2029
+hgt:186cm
+hcl:1d8307
+
+eyr:1935 iyr:1960 pid:346667344 ecl:grn hgt:170cm hcl:cfcc36
+
+ecl:oth byr:1979 pid:165581192
+hgt:177cm
+hcl:#c0946f
+iyr:2011
+
+iyr:2011 eyr:2030 pid:250840477
+byr:1934 cid:174 hgt:179cm hcl:#866857
+ecl:blu
+
+hgt:157cm hcl:#7d3b0c eyr:2027 pid:979510046
+ecl:oth
+
+iyr:2025
+hgt:69
+ecl:grt byr:1935
+eyr:1928 pid:168cm
+cid:271 hcl:z
+
+pid:998166233
+iyr:2020 hgt:166cm ecl:amb byr:1995 hcl:#fffffd
+
+hcl:#ceb3a1 ecl:amb
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+ecl:hzl eyr:2026
+byr:1969 pid:850482906 cid:166 hcl:#602927 hgt:60in
+iyr:2019
+
+hcl:#c0946f
+hgt:176cm
+ecl:brn eyr:2026 iyr:2018 cid:172 byr:1986 pid:172963254
+
+ecl:grn iyr:2016
+hgt:187cm
+byr:1983
+hcl:#efcc98
+pid:722084344 eyr:2025
+
+ecl:oth hcl:#341e13 pid:130312766 hgt:171cm iyr:2018 byr:1927 eyr:2024
+
+byr:2021 hgt:152cm hcl:74dda6
+eyr:1984 cid:216
+iyr:2018 pid:95283942
+
+hcl:#b6652a pid:924778815 iyr:2017 ecl:gry
+eyr:2035
+hgt:68cm
+
+iyr:2010
+hcl:#efcc98 ecl:brn eyr:2020 pid:801894599 hgt:163cm byr:1959
+
+pid:798701070 eyr:2030
+hcl:#866857 ecl:hzl hgt:169cm byr:1994 cid:219 iyr:2010
+
+pid:#e9b41b
+hcl:#341e13 byr:1970
+iyr:2014
+ecl:oth cid:266 hgt:68cm eyr:2023
+
+byr:1931 pid:929960843 hgt:187cm hcl:#6b5442 cid:52 iyr:2010 eyr:2024 ecl:brn
+
+iyr:2017 byr:1974
+ecl:hzl cid:243 pid:66053995 hgt:147 eyr:1920 hcl:z
+
+iyr:2012 byr:1962 ecl:brn pid:773399437 hcl:#341e13
+eyr:2026
+
+pid:738442771 hgt:186cm eyr:2027 hcl:#efcc98 iyr:2013
+ecl:brn byr:1928
+
+pid:855794198
+ecl:oth
+hgt:67in
+cid:81
+iyr:2011 hcl:#b6652a eyr:2020
+byr:1921
+
+hcl:176abf hgt:161in
+byr:2002 iyr:2016 eyr:2027 pid:639047770 ecl:brn
+cid:178
+
+pid:335686451
+hcl:#86c240 iyr:2017 hgt:190cm byr:1968 ecl:amb
+
+hgt:150cm
+hcl:094a87 ecl:#09c463 eyr:1926 pid:537511570 byr:2009
+iyr:1998
+
+hgt:74in
+pid:927963411
+eyr:2026 ecl:gry cid:323 iyr:2012 hcl:#fffffd byr:1959
+
+iyr:2018 byr:1978
+hcl:#ff1829 eyr:2023
+pid:823129853 ecl:hzl
+hgt:65in
+
+pid:189cm
+ecl:#00391e hgt:72cm hcl:11050f
+byr:2029
+eyr:1994
+iyr:1935
+cid:186
+
+ecl:grn byr:1942 pid:217290710 hgt:181cm eyr:2021 hcl:#7d3b0c iyr:2019 cid:320
+
+byr:1983 iyr:2013 cid:122 hcl:#ceb3a1 eyr:2030 hgt:59in ecl:grn pid:946451564
+
+ecl:amb
+cid:236 hgt:184cm
+hcl:#cfa07d iyr:2017 pid:934730535 eyr:2021 byr:2002
+
+byr:1950 ecl:hzl eyr:2030 hcl:#623a2f pid:742249321
+hgt:158cm iyr:2018
+
+byr:1946 eyr:2021 hcl:#a97842 pid:204671558 ecl:grn
+iyr:2010 hgt:187cm
+
+hcl:#b6652a pid:528124882 hgt:162cm byr:1924 ecl:amb iyr:2027 cid:157
+eyr:2028
+
+hgt:180cm iyr:2013 byr:1926 pid:232265934 hcl:#602927 ecl:oth
+
+byr:1984 ecl:brn
+iyr:2016 pid:756596443 eyr:2030 hcl:#7d3b0c hgt:183cm
+
+hgt:185cm
+hcl:#fffffd byr:1991 eyr:2023 iyr:2014
+ecl:amb
+pid:759105859
+
+cid:82 iyr:2012 hgt:160cm eyr:2022 pid:593798464 ecl:gry hcl:#4e7571 byr:1983
+
+pid:478427550
+iyr:2010
+ecl:amb byr:1969 hgt:68in cid:94 eyr:2021 hcl:#866857
+
+ecl:amb iyr:2019 byr:1986 hgt:170cm
+hcl:#c0946f
+pid:779205106 eyr:2027
+
+ecl:brn eyr:2025 byr:1925
+hcl:#7d3b0c hgt:76in pid:576353079 iyr:2010
+
+hgt:175cm hcl:4bf5ae ecl:amb
+eyr:2029 pid:173cm cid:329
+iyr:1952 byr:1972
+
+ecl:grn
+eyr:2030
+iyr:2015 hcl:#c0946f
+byr:1989
+hgt:178cm
+pid:287209519
+
+pid:834505198 byr:1985 ecl:gry eyr:2024
+cid:295 hgt:169cm iyr:2017
+
+hgt:170cm
+pid:054644831 eyr:2023 iyr:1949 ecl:amb
+hcl:#888785
+byr:1955
+
+hgt:171cm
+pid:947263309 iyr:2015 byr:1944 eyr:2027 ecl:grn cid:79 hcl:#341e13
+
+eyr:1982
+cid:147
+iyr:2015
+hgt:70cm hcl:a77c10 ecl:zzz byr:2007
+pid:161cm
+
+ecl:gry byr:1933
+hcl:#c0946f pid:483275512 iyr:2012 eyr:2025 hgt:161cm
+
+eyr:1985 hgt:176cm hcl:7b6ddc iyr:2012 cid:326 byr:1973 pid:929418396 ecl:gmt
+
+ecl:gry
+byr:1971
+hgt:184cm
+eyr:2027 hcl:#3adf2c iyr:2017 cid:210
+pid:693561862
+
+eyr:2021 pid:779298835 byr:1921 hgt:193cm ecl:amb
+iyr:2016 hcl:#ceb3a1
+
+hcl:4a1444
+byr:2019 iyr:2024 hgt:182in
+cid:87 ecl:#122264
+pid:181cm
+eyr:1927
+
+cid:267 ecl:amb eyr:2020 byr:2000
+hcl:#18171d iyr:2012 hgt:190cm pid:18525759
+
+ecl:oth byr:1988
+iyr:2019 pid:660570833
+hcl:#866857 hgt:176cm
+
+eyr:2030 hcl:#866857
+byr:1967 cid:316 pid:560346474 iyr:2015
+hgt:160cm
+ecl:gry
+
+ecl:hzl
+iyr:2014 hgt:164cm hcl:#733820 eyr:2025
+pid:106302413 byr:1920
+
+iyr:2016 pid:515066491
+ecl:grn eyr:2026 hgt:179cm hcl:#b6652a byr:1982
+
+ecl:#7de6a0
+iyr:2004 eyr:1955 hgt:154cm cid:138 byr:2004
+pid:758934555
+hcl:a21980
+
+pid:#2a21e0 ecl:#1b9b27 hgt:165in
+byr:1998 iyr:2014 eyr:2032
+
+eyr:2021 hgt:184cm pid:431054313 hcl:#ceb3a1 cid:109 byr:1977 ecl:blu
+iyr:2011
+
+pid:006339126 hgt:177cm
+cid:188 hcl:#a97842
+iyr:1959
+ecl:xry
+
+byr:2000
+ecl:hzl eyr:2029
+iyr:2011 hcl:#866857 hgt:74in
\ No newline at end of file
diff --git a/2020/day5/day5.py b/2020/day5/day5.py
new file mode 100644
index 0000000..df143ce
--- /dev/null
+++ b/2020/day5/day5.py
@@ -0,0 +1,69 @@
+#! /usr/bin/env python3
+from itertools import product
+from bisect import bisect
+
+
+def main(filename):
+    results = {}
+    with open(filename) as inp:
+        for line in inp:
+            boarding_pass = line.rstrip()
+            row, col = parse_boarding_pass(boarding_pass)
+            seat_id = get_seat_id(row, col)
+            results[boarding_pass] = (row, col, seat_id)
+    part1(results)
+    part2(results)
+
+
+def part1(results):
+    # part 1
+    max_seat_id = max(x[2] for x in results.values())
+    print("Max seat ID: ", max_seat_id)
+
+
+def part2(results):
+    seat_ids = sorted(x[2] for x in results.values())
+    missing_seat_ids = set(range(max(seat_ids))) - set(seat_ids)
+    print("Your seat id : ", max(missing_seat_ids))
+
+
+def parse_boarding_pass(boarding_pass, strategy="binary"):
+    "Poor man's dispatcher"
+    try: 
+        to_call = globals()[f"parse_boarding_pass_{strategy}"]
+        return to_call(boarding_pass)
+    except KeyError:
+        raise KeyError(f"Bad strategy name {strategy}")
+
+
+def parse_boarding_pass_binary(boarding_pass):
+    "Parse boarding pass using a binary conversion"
+    boarding_pass = boarding_pass.translate(str.maketrans("FLBR", "0011"))
+    row = boarding_pass[:7]
+    col = boarding_pass[7:]
+    return int(row, base=2), int(col, base=2)
+
+
+def parse_boarding_pass_bisect(boarding_pass):
+    "Pass boarding pass using bisection algorithm"
+    row = bisect(boarding_pass[:7], lower_option="F", upper_option="B", max=127)
+    col = bisect(boarding_pass[7:], lower_option="L", upper_option="R", max=7)
+    return row, col
+
+
+def bisect(inp, lower_option, upper_option, max):
+    min_v, max_v = 0, max
+    for l in inp:
+        length = max_v - min_v
+        if l == lower_option:
+            max_v = min_v + length // 2
+        elif l == upper_option:
+            min_v = 1 + min_v + length // 2
+    return min_v
+
+def get_seat_id(row, col):
+    return 8 * row + col
+
+
+if __name__ == "__main__":
+    main('input.txt')
diff --git a/2020/day5/input.txt b/2020/day5/input.txt
new file mode 100644
index 0000000..2f95cdb
--- /dev/null
+++ b/2020/day5/input.txt
@@ -0,0 +1,757 @@
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\ No newline at end of file
diff --git a/2020/day5/tests.py b/2020/day5/tests.py
new file mode 100644
index 0000000..32ace84
--- /dev/null
+++ b/2020/day5/tests.py
@@ -0,0 +1,27 @@
+#! /usr/bin/env python3
+from day5 import *
+
+def tests():
+    inputs = {
+        "FBFBBFFRLR": (44, 5, 357),
+        "BFFFBBFRRR": (70, 7, 567),
+        "FFFBBBFRRR": (14, 7, 119),
+        "BBFFBBFRLL": (102, 4, 820)
+    }
+
+    test("bisect", inputs)
+    test("binary", inputs)
+
+
+def test(strategy, inputs):
+    for boarding_pass, expected in inputs.items():
+        row, col = parse_boarding_pass(boarding_pass, strategy=strategy)
+        seat_id =  get_seat_id(row, col)
+        assert row == expected[0]
+        assert col == expected[1]
+        assert seat_id == expected[2]
+        print(row, col, seat_id, expected)
+
+
+if __name__ == "__main__":
+    tests()
diff --git a/2020/day6/day6.py b/2020/day6/day6.py
new file mode 100644
index 0000000..c3f8a72
--- /dev/null
+++ b/2020/day6/day6.py
@@ -0,0 +1,29 @@
+#! /usr/bin/env python3
+from collections import Counter
+
+
+def part1(inp):
+    groups = open(inp).read().split("\n\n")
+    number_of_questions = 0
+    for group in groups:
+        unique_questions = set(group.replace("\n", ""))
+        number_of_questions += len(unique_questions)
+    print(number_of_questions)
+
+
+def part2(inp):
+    # number of questions for which everyone in a group answered 'yes'
+    number_of_questions = 0
+    groups = open(inp).read().split("\n\n")
+
+    for group in groups:
+        group_length = group.count("\n") + 1
+        group_counter = Counter(group.replace("\n", ""))
+        everyone_answered = [k for (k, v) in group_counter.items() if v == group_length]
+        number_of_questions += len(everyone_answered)
+    print(number_of_questions)
+
+
+if __name__ == "__main__":
+    part1("input.txt")
+    part2("input.txt")
diff --git a/2020/day6/input.txt b/2020/day6/input.txt
new file mode 100644
index 0000000..790070a
--- /dev/null
+++ b/2020/day6/input.txt
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diff --git a/2020/day7/day7.py b/2020/day7/day7.py
new file mode 100644
index 0000000..0a49c32
--- /dev/null
+++ b/2020/day7/day7.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+import re
+from collections import defaultdict, deque
+
+
+def main(inp):
+    with open(inp) as input_rules:
+        rules = parse_rules(input_rules)
+        reverse_rules = build_reverse_rules(rules)
+        print(part1(reverse_rules))
+        print(part2(rules, "shiny gold"))
+
+
+def parse_rules(input_rules):
+    rules = {}
+    for input_rule in input_rules:
+        color, rule = input_rule.split(" bags contain ")
+        rules[color] = {color: int(number) for number, color in re.findall('(\d+) (\w+ \w+)', rule)}
+    return rules
+
+
+def build_reverse_rules(rules):
+    reverse_rules = defaultdict(list)
+    for bag, inner_rules in rules.items():
+        for c in inner_rules:
+            reverse_rules[c].append(bag)
+    return reverse_rules
+
+
+def part1(reverse_rules):
+    queue  = deque(("shiny gold",))
+    may_contain_shiny_gold = set()
+    while queue:
+        color = queue.pop()
+        for c in reverse_rules.get(color, []):
+            if c not in may_contain_shiny_gold:
+                may_contain_shiny_gold.add(c)
+                queue.appendleft(c)
+    return len(may_contain_shiny_gold)
+
+
+def part2(rules, color):
+    return sum(number + number * part2(rules, c) for c, number in rules[color].items())
+
+
+if __name__ == "__main__":
+    main("input.txt")
diff --git a/2020/day7/input.txt b/2020/day7/input.txt
new file mode 100644
index 0000000..e1380ca
--- /dev/null
+++ b/2020/day7/input.txt
@@ -0,0 +1,594 @@
+pale cyan bags contain 2 posh black bags, 4 wavy gold bags, 2 vibrant brown bags.
+dull lavender bags contain 3 pale tomato bags.
+light red bags contain 3 wavy teal bags, 3 plaid aqua bags, 4 drab lavender bags, 2 bright coral bags.
+wavy green bags contain 3 wavy indigo bags.
+bright blue bags contain 5 vibrant tan bags.
+dotted fuchsia bags contain 5 dark orange bags, 1 shiny coral bag.
+pale tomato bags contain 2 bright magenta bags, 5 dull lime bags.
+light black bags contain 1 posh lavender bag, 5 dotted gold bags, 4 faded bronze bags.
+wavy turquoise bags contain 4 pale teal bags, 2 dim brown bags, 5 muted lime bags.
+striped red bags contain 4 faded brown bags, 4 dotted purple bags.
+wavy silver bags contain 5 muted chartreuse bags, 1 light silver bag, 3 striped silver bags.
+posh lavender bags contain 5 striped silver bags, 3 wavy beige bags, 3 dim brown bags, 5 clear indigo bags.
+pale maroon bags contain 1 striped white bag, 4 light blue bags.
+drab turquoise bags contain 2 shiny tomato bags.
+dark aqua bags contain 2 plaid silver bags.
+vibrant coral bags contain 3 wavy lime bags, 2 shiny gold bags, 1 dotted orange bag, 3 muted indigo bags.
+clear green bags contain 1 clear olive bag.
+striped indigo bags contain 3 striped turquoise bags.
+clear lime bags contain 3 mirrored green bags, 2 light tan bags.
+drab bronze bags contain 5 plaid lavender bags, 1 muted yellow bag, 5 vibrant coral bags.
+drab lavender bags contain 1 posh tomato bag, 4 muted salmon bags, 4 dull lime bags.
+striped aqua bags contain 1 pale maroon bag.
+wavy gray bags contain 3 light tan bags, 2 pale white bags, 2 bright magenta bags, 5 muted salmon bags.
+faded aqua bags contain 1 plaid salmon bag, 4 dotted yellow bags.
+drab cyan bags contain 1 posh tomato bag, 4 shiny turquoise bags.
+vibrant blue bags contain no other bags.
+light lime bags contain 3 vibrant purple bags.
+clear gray bags contain 3 mirrored olive bags, 3 clear crimson bags, 5 dark orange bags, 2 dim gold bags.
+bright magenta bags contain no other bags.
+wavy purple bags contain 4 dim gold bags, 5 light green bags.
+muted bronze bags contain 2 pale beige bags, 2 clear turquoise bags, 5 posh white bags, 1 wavy gray bag.
+striped violet bags contain 1 light gold bag.
+dull salmon bags contain 2 posh gray bags, 2 dotted blue bags.
+striped orange bags contain 3 faded coral bags, 3 dotted lavender bags.
+drab coral bags contain 1 wavy indigo bag, 1 dull black bag, 3 mirrored chartreuse bags.
+plaid yellow bags contain 5 faded cyan bags.
+dark maroon bags contain 2 mirrored silver bags, 5 muted salmon bags, 1 dull tomato bag.
+dark yellow bags contain 1 drab maroon bag, 5 faded cyan bags, 4 clear indigo bags.
+posh teal bags contain 3 vibrant maroon bags, 3 posh salmon bags.
+mirrored black bags contain 1 drab fuchsia bag, 2 posh red bags.
+drab salmon bags contain 2 dull plum bags.
+muted green bags contain 4 plaid gray bags, 2 dim turquoise bags, 2 dull coral bags, 4 dim white bags.
+bright indigo bags contain 1 bright turquoise bag, 4 dark beige bags.
+wavy fuchsia bags contain 1 clear violet bag, 4 striped bronze bags, 1 mirrored indigo bag, 1 shiny cyan bag.
+bright brown bags contain 5 dark purple bags.
+dull turquoise bags contain 3 dim yellow bags, 2 dim indigo bags.
+pale coral bags contain 4 posh indigo bags.
+striped green bags contain 4 dull green bags, 5 dotted turquoise bags, 3 pale red bags, 2 dark gold bags.
+faded maroon bags contain 3 dim green bags, 4 wavy purple bags.
+vibrant lime bags contain 3 shiny fuchsia bags, 1 pale red bag, 1 vibrant bronze bag.
+shiny plum bags contain 2 bright maroon bags, 5 dull tomato bags, 2 plaid salmon bags, 3 bright lime bags.
+faded silver bags contain 1 posh turquoise bag, 5 posh white bags, 5 wavy lime bags, 3 shiny coral bags.
+mirrored tomato bags contain 3 dotted tomato bags, 4 vibrant blue bags, 4 dull yellow bags, 5 clear chartreuse bags.
+pale red bags contain 5 vibrant indigo bags, 4 vibrant red bags, 3 bright magenta bags, 3 dim indigo bags.
+drab blue bags contain 2 bright magenta bags.
+dim purple bags contain 4 drab lavender bags, 4 plaid yellow bags, 5 dull white bags, 3 clear white bags.
+dim red bags contain 5 striped silver bags, 1 shiny red bag.
+dim lime bags contain 5 plaid bronze bags, 5 drab salmon bags.
+mirrored beige bags contain 3 bright tomato bags, 2 dull lime bags.
+bright lime bags contain 5 clear chartreuse bags.
+clear chartreuse bags contain 1 muted white bag, 1 vibrant bronze bag, 2 vibrant maroon bags, 4 clear lime bags.
+dotted indigo bags contain 4 pale olive bags, 1 bright violet bag, 3 drab gray bags.
+striped crimson bags contain 3 muted salmon bags.
+plaid green bags contain 3 posh tomato bags.
+dim brown bags contain 3 striped teal bags, 3 vibrant aqua bags, 3 plaid yellow bags.
+faded turquoise bags contain 2 dim blue bags, 3 clear green bags, 3 striped bronze bags, 2 dim beige bags.
+dotted coral bags contain 2 vibrant silver bags, 3 plaid crimson bags, 4 dull silver bags, 1 muted blue bag.
+mirrored magenta bags contain 3 striped teal bags, 1 mirrored black bag, 4 shiny black bags.
+shiny gray bags contain 3 bright magenta bags.
+mirrored violet bags contain 5 drab blue bags, 5 dark brown bags.
+dark beige bags contain 2 vibrant blue bags, 2 bright magenta bags, 1 dim indigo bag.
+dark bronze bags contain 3 vibrant chartreuse bags, 2 posh turquoise bags, 4 faded aqua bags.
+clear turquoise bags contain 1 mirrored green bag, 1 faded indigo bag, 4 shiny aqua bags, 4 dim tomato bags.
+dark silver bags contain 5 posh purple bags, 4 dull silver bags.
+dull tan bags contain 2 striped brown bags, 3 vibrant salmon bags, 1 drab gold bag.
+mirrored gray bags contain 2 dim white bags, 4 muted white bags, 1 muted orange bag, 3 muted magenta bags.
+faded black bags contain 3 faded aqua bags, 4 drab white bags, 2 dull lavender bags, 1 bright purple bag.
+light fuchsia bags contain 3 pale magenta bags.
+wavy lavender bags contain no other bags.
+dull black bags contain 1 mirrored teal bag.
+vibrant chartreuse bags contain 1 dull violet bag, 4 posh turquoise bags.
+posh yellow bags contain 5 wavy gold bags.
+shiny teal bags contain 2 drab salmon bags, 5 striped crimson bags.
+plaid fuchsia bags contain 3 dim brown bags, 2 posh bronze bags, 1 striped aqua bag, 1 shiny chartreuse bag.
+faded yellow bags contain 1 dotted tan bag, 3 dark coral bags.
+mirrored orange bags contain 3 pale coral bags.
+wavy indigo bags contain 5 shiny coral bags, 2 shiny yellow bags, 2 striped brown bags.
+dotted salmon bags contain 1 drab turquoise bag, 1 vibrant lime bag, 3 dull chartreuse bags, 1 vibrant maroon bag.
+dull magenta bags contain 3 shiny coral bags, 5 dull violet bags, 5 mirrored violet bags.
+shiny tomato bags contain 1 dim salmon bag, 1 dim olive bag.
+drab gold bags contain 3 drab maroon bags, 1 dotted black bag, 4 plaid orange bags.
+bright yellow bags contain 4 muted teal bags, 1 faded maroon bag, 5 posh chartreuse bags, 5 plaid indigo bags.
+dull plum bags contain 1 shiny salmon bag, 3 light tan bags.
+posh gray bags contain 3 muted lime bags, 2 dotted green bags.
+clear violet bags contain 5 vibrant maroon bags.
+dotted bronze bags contain 3 light tan bags, 4 shiny yellow bags, 3 mirrored brown bags, 1 plaid yellow bag.
+mirrored lime bags contain 2 bright teal bags, 2 dim gold bags, 2 dull tomato bags, 3 wavy green bags.
+shiny indigo bags contain 3 dull silver bags, 2 dim cyan bags, 2 striped magenta bags.
+vibrant crimson bags contain 2 light chartreuse bags.
+dim magenta bags contain 5 plaid olive bags, 2 muted green bags, 4 bright crimson bags.
+dim blue bags contain 1 bright silver bag, 2 shiny gray bags.
+plaid teal bags contain 4 shiny aqua bags, 1 dull fuchsia bag, 4 bright lime bags.
+dull teal bags contain 2 dotted black bags.
+plaid gray bags contain 5 muted brown bags.
+pale teal bags contain 5 striped olive bags, 1 dotted fuchsia bag, 3 dark teal bags, 2 dim purple bags.
+clear beige bags contain 3 pale lime bags, 4 striped aqua bags, 3 mirrored red bags.
+mirrored green bags contain 4 mirrored olive bags, 5 dim salmon bags, 4 vibrant bronze bags.
+plaid aqua bags contain 2 pale white bags, 1 dull plum bag, 4 mirrored olive bags, 3 dim maroon bags.
+pale aqua bags contain 5 bright salmon bags, 4 vibrant silver bags, 2 light orange bags.
+plaid crimson bags contain 3 striped magenta bags.
+mirrored red bags contain 5 dull coral bags, 5 pale yellow bags, 5 drab maroon bags, 2 dim gray bags.
+pale black bags contain 1 light red bag, 4 faded teal bags.
+dim turquoise bags contain 5 faded purple bags, 4 wavy fuchsia bags, 3 vibrant purple bags, 2 pale beige bags.
+dim lavender bags contain 1 light blue bag.
+pale gray bags contain 3 mirrored red bags, 5 light indigo bags.
+clear magenta bags contain 5 bright gold bags, 5 dim lavender bags, 1 wavy lavender bag.
+dull gold bags contain 4 dull fuchsia bags, 3 vibrant tan bags.
+dim salmon bags contain 5 dull yellow bags, 4 pale beige bags.
+drab magenta bags contain 2 vibrant salmon bags.
+vibrant green bags contain 3 bright purple bags, 5 wavy brown bags, 5 dotted gray bags, 1 posh bronze bag.
+dull brown bags contain 1 wavy tan bag, 1 shiny salmon bag.
+clear white bags contain 5 bright lime bags, 3 light tan bags.
+dotted lavender bags contain 5 wavy cyan bags, 2 dark indigo bags, 4 shiny gold bags.
+dotted purple bags contain 5 dull teal bags, 3 shiny plum bags.
+drab yellow bags contain 3 faded beige bags, 3 light silver bags.
+dark orange bags contain 5 bright lime bags.
+dotted cyan bags contain 1 vibrant lime bag, 1 wavy maroon bag, 2 dull tan bags, 5 shiny salmon bags.
+posh indigo bags contain 5 dull yellow bags, 1 vibrant bronze bag.
+dull chartreuse bags contain 2 wavy lavender bags, 5 vibrant blue bags.
+posh blue bags contain 3 wavy maroon bags.
+dim teal bags contain 3 muted turquoise bags, 1 vibrant black bag, 5 dotted tomato bags.
+pale purple bags contain 1 striped olive bag.
+drab chartreuse bags contain 1 clear orange bag, 2 plaid turquoise bags, 2 drab maroon bags.
+plaid white bags contain 4 plaid indigo bags, 5 vibrant lime bags.
+vibrant bronze bags contain 5 vibrant blue bags, 1 drab blue bag, 1 dull lime bag.
+bright bronze bags contain 3 muted magenta bags, 3 dotted black bags, 1 pale lime bag, 2 dull violet bags.
+dark indigo bags contain 3 bright maroon bags.
+muted lavender bags contain 1 light white bag, 2 clear white bags, 2 posh white bags, 3 dim purple bags.
+vibrant violet bags contain 5 dull magenta bags, 4 posh coral bags.
+drab beige bags contain 2 plaid magenta bags, 2 muted bronze bags, 2 muted purple bags.
+drab plum bags contain 4 mirrored tomato bags, 3 light lavender bags, 3 mirrored green bags, 5 muted salmon bags.
+mirrored fuchsia bags contain 1 mirrored tomato bag, 5 dotted black bags, 2 posh white bags.
+pale crimson bags contain 4 light plum bags.
+dotted black bags contain 3 bright maroon bags.
+wavy tomato bags contain 1 dim black bag, 5 vibrant coral bags, 1 mirrored purple bag.
+bright aqua bags contain 5 pale lime bags, 3 striped teal bags.
+vibrant purple bags contain 2 clear turquoise bags, 4 vibrant bronze bags, 1 dark lime bag, 3 clear crimson bags.
+vibrant tan bags contain 4 posh black bags.
+plaid turquoise bags contain 2 dotted violet bags, 5 mirrored plum bags.
+dim violet bags contain 3 dotted orange bags.
+bright tan bags contain 2 dark indigo bags, 4 faded purple bags, 4 dim blue bags.
+muted chartreuse bags contain 4 dotted black bags, 5 mirrored tomato bags.
+muted gold bags contain 2 wavy gray bags, 4 clear gold bags, 1 shiny gold bag.
+dull indigo bags contain 3 mirrored maroon bags.
+clear aqua bags contain 4 dim plum bags, 5 bright bronze bags.
+muted maroon bags contain 1 striped crimson bag, 3 vibrant aqua bags.
+muted blue bags contain 4 clear magenta bags, 4 pale bronze bags, 2 dull black bags, 4 striped olive bags.
+drab aqua bags contain 3 faded crimson bags.
+shiny olive bags contain 4 shiny salmon bags, 2 wavy plum bags, 4 pale bronze bags, 3 posh gold bags.
+striped bronze bags contain 4 plaid olive bags, 4 plaid indigo bags, 1 pale white bag, 3 striped magenta bags.
+mirrored gold bags contain 2 faded lavender bags.
+faded blue bags contain 1 plaid bronze bag, 3 dim olive bags, 2 wavy crimson bags, 4 plaid silver bags.
+plaid lime bags contain 2 dim yellow bags.
+mirrored brown bags contain 4 light crimson bags.
+plaid red bags contain 5 shiny aqua bags, 5 wavy lavender bags, 1 posh beige bag.
+mirrored coral bags contain 4 mirrored lime bags, 5 muted orange bags, 5 dotted salmon bags, 1 faded purple bag.
+mirrored olive bags contain 2 vibrant blue bags.
+pale orange bags contain 4 wavy lime bags.
+drab maroon bags contain 1 shiny yellow bag, 3 dull yellow bags, 1 wavy lavender bag, 2 dim salmon bags.
+drab purple bags contain 5 bright tomato bags, 4 striped bronze bags, 2 bright chartreuse bags, 2 dark violet bags.
+striped lime bags contain 5 posh turquoise bags, 1 dim purple bag.
+wavy beige bags contain 5 shiny tomato bags, 3 drab lavender bags, 1 shiny orange bag.
+bright gold bags contain 5 vibrant red bags, 1 shiny orange bag, 3 striped bronze bags.
+muted magenta bags contain 4 light olive bags, 3 dotted tan bags.
+dark lime bags contain 5 wavy lavender bags, 4 clear maroon bags, 2 striped beige bags, 4 plaid salmon bags.
+pale silver bags contain 3 faded lavender bags, 2 dotted purple bags, 3 wavy crimson bags.
+posh turquoise bags contain 5 dim yellow bags, 4 posh lime bags, 5 shiny orange bags.
+shiny coral bags contain 2 dull tomato bags.
+dim tomato bags contain 3 shiny aqua bags, 3 light cyan bags.
+plaid tomato bags contain 3 faded indigo bags.
+clear tan bags contain 3 mirrored indigo bags.
+wavy maroon bags contain 1 dark silver bag.
+drab teal bags contain 5 muted salmon bags, 4 plaid yellow bags, 4 bright red bags, 2 posh teal bags.
+dim plum bags contain 5 posh salmon bags, 5 faded purple bags, 2 posh brown bags.
+bright fuchsia bags contain 2 dark beige bags, 3 faded yellow bags.
+clear silver bags contain 2 plaid tomato bags, 4 muted chartreuse bags.
+shiny purple bags contain 5 muted lavender bags, 2 clear turquoise bags, 4 muted teal bags.
+dark red bags contain 3 plaid plum bags, 2 dim indigo bags, 2 wavy gray bags.
+dark white bags contain 4 muted bronze bags, 5 mirrored gold bags, 3 plaid lavender bags.
+drab silver bags contain 1 dark gold bag, 3 muted white bags.
+dark green bags contain 3 posh turquoise bags.
+striped white bags contain 1 vibrant maroon bag, 1 shiny salmon bag.
+striped lavender bags contain 1 light tomato bag, 5 light lime bags, 1 posh gold bag.
+mirrored tan bags contain 2 posh fuchsia bags.
+pale salmon bags contain 4 shiny blue bags.
+dark black bags contain 1 dotted coral bag, 1 faded crimson bag, 4 drab violet bags, 5 clear chartreuse bags.
+vibrant red bags contain 1 dim gold bag, 2 dull yellow bags, 1 faded brown bag, 4 light cyan bags.
+pale turquoise bags contain 5 clear cyan bags.
+bright olive bags contain 1 clear turquoise bag, 4 bright teal bags, 3 striped maroon bags, 1 striped gold bag.
+shiny green bags contain 5 dim lime bags, 3 wavy brown bags, 2 faded magenta bags, 5 drab maroon bags.
+vibrant tomato bags contain 3 striped plum bags, 2 vibrant maroon bags, 4 muted silver bags, 3 striped chartreuse bags.
+vibrant yellow bags contain 3 pale beige bags, 4 dim orange bags, 4 dotted cyan bags.
+muted aqua bags contain 3 vibrant purple bags.
+dull orange bags contain 2 striped gray bags, 3 vibrant bronze bags, 2 bright turquoise bags.
+wavy cyan bags contain 2 drab maroon bags, 4 shiny aqua bags, 5 clear lime bags.
+faded tan bags contain 3 muted turquoise bags, 2 plaid purple bags, 3 clear crimson bags.
+light maroon bags contain 5 wavy chartreuse bags, 3 mirrored silver bags, 5 muted plum bags, 2 mirrored blue bags.
+shiny lavender bags contain 1 dark silver bag, 5 clear teal bags, 5 dark red bags, 4 faded red bags.
+striped fuchsia bags contain 4 clear gold bags, 3 bright magenta bags, 3 bright aqua bags.
+striped plum bags contain 4 bright lime bags, 5 dotted black bags, 5 drab beige bags.
+dotted red bags contain 4 dim gold bags, 3 dim indigo bags, 4 striped olive bags, 5 dim white bags.
+mirrored chartreuse bags contain 5 posh tomato bags.
+dim white bags contain 5 clear maroon bags.
+muted black bags contain 2 posh turquoise bags, 3 clear lavender bags, 2 shiny aqua bags, 2 pale red bags.
+muted silver bags contain 4 striped white bags, 5 dotted tomato bags, 4 mirrored fuchsia bags, 2 clear maroon bags.
+dotted lime bags contain 1 muted aqua bag, 3 mirrored tan bags.
+faded chartreuse bags contain 4 vibrant violet bags, 5 faded magenta bags, 5 dim teal bags, 2 dim green bags.
+light turquoise bags contain 1 dotted purple bag.
+plaid cyan bags contain 1 bright magenta bag, 2 wavy chartreuse bags, 5 vibrant silver bags, 3 pale crimson bags.
+dull maroon bags contain 5 dim black bags.
+wavy violet bags contain 1 faded yellow bag.
+vibrant teal bags contain 5 dim lime bags, 2 vibrant gold bags, 2 dim beige bags.
+pale fuchsia bags contain 3 striped olive bags.
+light brown bags contain 3 shiny chartreuse bags, 2 wavy purple bags.
+dull green bags contain 3 striped orange bags, 2 posh indigo bags, 3 faded blue bags.
+dark blue bags contain 5 striped magenta bags, 3 striped gray bags, 4 pale coral bags.
+mirrored lavender bags contain 3 posh black bags.
+shiny brown bags contain 5 dotted magenta bags, 4 dim chartreuse bags, 1 posh cyan bag.
+muted brown bags contain 3 dull black bags, 3 pale maroon bags, 5 posh brown bags, 2 striped gray bags.
+faded orange bags contain 1 dark orange bag.
+muted fuchsia bags contain 3 plaid salmon bags.
+clear plum bags contain 3 shiny red bags, 4 dim silver bags.
+bright coral bags contain 4 pale yellow bags, 2 muted magenta bags, 2 bright chartreuse bags, 3 light olive bags.
+muted coral bags contain 4 striped green bags.
+drab olive bags contain 3 shiny salmon bags, 4 clear cyan bags.
+dim silver bags contain 2 shiny plum bags.
+wavy plum bags contain 3 mirrored fuchsia bags, 5 pale maroon bags, 5 posh salmon bags.
+plaid coral bags contain 1 mirrored gold bag.
+posh beige bags contain 3 mirrored maroon bags, 3 drab chartreuse bags, 3 dark salmon bags, 1 clear green bag.
+drab green bags contain 1 bright teal bag, 3 muted chartreuse bags.
+bright crimson bags contain 3 striped orange bags, 4 wavy plum bags.
+posh chartreuse bags contain 5 clear white bags, 3 light red bags.
+dim gray bags contain 1 mirrored fuchsia bag, 3 muted teal bags, 4 clear maroon bags, 5 striped white bags.
+striped brown bags contain 2 muted orange bags.
+dim tan bags contain 3 clear gold bags, 5 clear salmon bags, 2 dark chartreuse bags.
+striped magenta bags contain 2 plaid indigo bags, 5 drab lavender bags, 2 dotted fuchsia bags, 4 shiny aqua bags.
+dotted violet bags contain 3 dull tomato bags.
+dotted tan bags contain 1 dark orange bag, 2 drab blue bags.
+shiny beige bags contain 1 drab gold bag.
+light plum bags contain 5 plaid tomato bags, 5 wavy gray bags, 1 dull tomato bag.
+muted indigo bags contain 3 dim salmon bags.
+clear red bags contain 3 mirrored beige bags.
+mirrored silver bags contain 2 wavy plum bags, 4 vibrant magenta bags.
+dark lavender bags contain 2 wavy violet bags, 5 muted green bags, 2 dim purple bags.
+clear teal bags contain 4 wavy crimson bags.
+light purple bags contain 5 faded black bags.
+light salmon bags contain 3 vibrant beige bags, 3 striped white bags, 5 pale magenta bags, 5 muted blue bags.
+dull gray bags contain 5 dim lavender bags.
+posh aqua bags contain 1 light olive bag, 4 mirrored purple bags, 4 vibrant gold bags, 1 shiny aqua bag.
+pale chartreuse bags contain 5 faded indigo bags.
+striped cyan bags contain 1 shiny olive bag, 3 bright tomato bags, 1 faded beige bag.
+clear coral bags contain 5 clear violet bags, 1 plaid tomato bag.
+bright cyan bags contain 3 mirrored violet bags, 5 plaid magenta bags, 4 vibrant bronze bags.
+posh tomato bags contain 3 shiny aqua bags, 1 pale beige bag.
+bright lavender bags contain 4 clear beige bags, 2 faded lavender bags, 3 faded aqua bags, 5 pale purple bags.
+dotted teal bags contain 5 plaid salmon bags, 1 posh turquoise bag, 2 muted silver bags.
+clear tomato bags contain 5 bright indigo bags.
+dotted silver bags contain 2 mirrored indigo bags.
+plaid plum bags contain 4 light crimson bags.
+wavy magenta bags contain 2 posh indigo bags, 2 vibrant indigo bags.
+dull tomato bags contain 4 dull lime bags, 4 faded brown bags.
+vibrant black bags contain 5 light crimson bags, 5 pale lavender bags, 3 dull blue bags, 2 pale coral bags.
+pale bronze bags contain 3 vibrant violet bags.
+wavy lime bags contain 5 shiny yellow bags, 2 pale white bags, 1 clear gold bag, 5 mirrored chartreuse bags.
+striped gray bags contain 3 shiny tomato bags, 3 dull coral bags, 1 shiny aqua bag, 2 dark orange bags.
+faded crimson bags contain 4 pale white bags, 3 muted bronze bags, 2 posh blue bags, 3 bright coral bags.
+wavy orange bags contain 2 shiny indigo bags.
+dotted white bags contain 1 striped tan bag, 4 bright silver bags, 1 shiny fuchsia bag, 3 posh gray bags.
+posh bronze bags contain 4 muted silver bags, 1 light lavender bag.
+dotted magenta bags contain 5 clear fuchsia bags, 4 faded indigo bags, 3 dull turquoise bags, 4 muted orange bags.
+dull cyan bags contain 3 clear teal bags, 3 dim white bags, 3 dull tomato bags, 5 vibrant purple bags.
+clear gold bags contain 4 dim gold bags, 3 dull lime bags, 4 faded brown bags, 4 wavy gray bags.
+bright beige bags contain 3 dull cyan bags, 4 bright indigo bags, 2 dull lime bags.
+clear orange bags contain 5 shiny salmon bags.
+plaid silver bags contain 5 dotted purple bags, 1 dim maroon bag, 3 muted gold bags.
+shiny white bags contain 1 light brown bag, 1 mirrored lime bag.
+dark gray bags contain 5 shiny cyan bags, 2 drab tomato bags.
+drab white bags contain 4 shiny tomato bags, 3 shiny gold bags, 3 dull lime bags, 3 plaid orange bags.
+vibrant cyan bags contain 2 wavy purple bags, 4 light gold bags, 1 pale indigo bag, 2 striped fuchsia bags.
+shiny yellow bags contain 4 shiny aqua bags, 2 dim salmon bags, 3 posh tomato bags, 5 muted salmon bags.
+posh coral bags contain 2 striped gray bags, 4 dark orange bags, 5 posh magenta bags.
+clear salmon bags contain 4 posh yellow bags, 2 pale violet bags, 3 mirrored violet bags.
+posh olive bags contain 2 mirrored red bags, 3 faded gold bags.
+faded fuchsia bags contain 5 bright gold bags, 3 pale tomato bags, 2 dotted bronze bags, 1 mirrored green bag.
+striped maroon bags contain 4 posh maroon bags, 4 dim indigo bags, 5 shiny aqua bags, 4 posh lime bags.
+dark violet bags contain 5 plaid tomato bags, 3 bright lime bags, 4 light lavender bags, 4 dark brown bags.
+dim maroon bags contain 1 dark beige bag, 4 wavy gray bags, 5 shiny coral bags, 1 pale white bag.
+wavy crimson bags contain 1 light tan bag, 5 dark beige bags.
+plaid magenta bags contain 1 shiny turquoise bag, 1 dark lime bag, 5 dim salmon bags.
+clear indigo bags contain 4 muted maroon bags.
+clear olive bags contain 5 mirrored teal bags, 1 plaid lime bag, 3 dull magenta bags, 5 wavy gray bags.
+mirrored white bags contain 3 pale gold bags.
+wavy blue bags contain 1 dotted aqua bag, 5 dark green bags.
+faded cyan bags contain 4 wavy gray bags, 5 vibrant bronze bags, 1 mirrored olive bag, 3 drab blue bags.
+faded gray bags contain 2 drab brown bags, 4 dotted coral bags, 5 dim turquoise bags, 1 mirrored maroon bag.
+dim coral bags contain 5 shiny olive bags, 3 light plum bags.
+vibrant fuchsia bags contain 5 shiny chartreuse bags, 5 wavy bronze bags, 2 bright red bags.
+dotted tomato bags contain 5 faded indigo bags, 3 vibrant maroon bags, 4 shiny coral bags.
+faded salmon bags contain 3 dull silver bags, 2 wavy bronze bags, 2 drab teal bags.
+vibrant orange bags contain 1 dotted beige bag.
+muted violet bags contain 5 posh lime bags.
+striped tan bags contain 3 muted lime bags.
+drab violet bags contain 3 vibrant chartreuse bags, 5 posh turquoise bags, 1 bright cyan bag.
+bright purple bags contain 2 vibrant bronze bags, 3 wavy beige bags, 2 plaid bronze bags.
+vibrant maroon bags contain no other bags.
+muted teal bags contain 2 bright turquoise bags.
+bright plum bags contain 5 dark gold bags, 2 shiny turquoise bags, 1 dull yellow bag.
+shiny crimson bags contain 3 wavy magenta bags.
+wavy teal bags contain 5 faded indigo bags, 4 dotted gray bags, 3 pale chartreuse bags, 3 vibrant coral bags.
+shiny blue bags contain 2 shiny salmon bags, 4 light tan bags, 1 dim salmon bag.
+mirrored maroon bags contain 1 drab fuchsia bag, 3 dotted green bags, 3 muted white bags.
+clear maroon bags contain 2 vibrant red bags, 5 bright maroon bags, 4 light olive bags.
+bright salmon bags contain 1 dotted red bag, 4 vibrant beige bags, 3 dark maroon bags, 3 clear lavender bags.
+pale gold bags contain 3 plaid olive bags.
+faded lime bags contain 3 faded maroon bags, 5 mirrored aqua bags.
+faded magenta bags contain 4 plaid orange bags, 5 vibrant violet bags, 1 dotted green bag, 3 wavy crimson bags.
+wavy aqua bags contain 5 drab yellow bags, 5 posh bronze bags.
+faded brown bags contain 3 mirrored green bags, 5 dim salmon bags, 4 vibrant blue bags, 1 wavy gray bag.
+dark purple bags contain 4 pale beige bags, 3 drab lavender bags.
+dull lime bags contain no other bags.
+light orange bags contain 1 vibrant white bag, 1 striped magenta bag.
+mirrored plum bags contain 1 clear green bag, 4 faded blue bags.
+vibrant brown bags contain 4 dark crimson bags, 5 light plum bags.
+shiny turquoise bags contain 1 dark lime bag.
+dark plum bags contain 2 wavy coral bags, 2 striped gray bags, 4 muted blue bags, 2 dull aqua bags.
+shiny red bags contain 1 plaid gray bag, 4 wavy beige bags, 5 dark red bags.
+posh violet bags contain 5 striped chartreuse bags, 2 pale maroon bags, 1 dull lime bag.
+light silver bags contain 2 clear silver bags, 1 dark indigo bag, 2 dim salmon bags, 2 drab salmon bags.
+plaid orange bags contain 4 dim gold bags, 2 bright magenta bags, 4 drab lavender bags.
+vibrant silver bags contain 5 posh plum bags, 3 vibrant aqua bags, 2 light lavender bags.
+faded tomato bags contain 1 pale coral bag, 2 posh gold bags.
+shiny silver bags contain 4 faded orange bags, 1 striped white bag, 2 faded turquoise bags, 5 striped gray bags.
+plaid purple bags contain 2 posh olive bags, 3 pale maroon bags, 3 pale gold bags, 1 faded white bag.
+light tomato bags contain 2 vibrant indigo bags, 4 dark orange bags, 5 muted bronze bags, 4 plaid tomato bags.
+dull aqua bags contain 5 bright lime bags.
+drab red bags contain 5 posh teal bags.
+dotted gray bags contain 2 vibrant salmon bags, 4 mirrored chartreuse bags, 1 dotted tomato bag, 4 posh magenta bags.
+dull bronze bags contain 3 mirrored brown bags.
+shiny aqua bags contain no other bags.
+dim gold bags contain no other bags.
+pale blue bags contain 4 posh gray bags.
+faded purple bags contain 5 shiny blue bags, 5 plaid salmon bags, 4 pale tomato bags, 2 dark gold bags.
+striped teal bags contain 4 mirrored green bags.
+shiny orange bags contain 4 faded lavender bags, 2 muted salmon bags, 2 dim indigo bags.
+wavy yellow bags contain 5 clear silver bags, 2 shiny brown bags.
+vibrant turquoise bags contain 1 vibrant magenta bag, 4 dull fuchsia bags, 5 mirrored green bags.
+dark teal bags contain 5 dim tomato bags.
+posh brown bags contain 3 dark orange bags.
+vibrant gray bags contain 2 dark beige bags, 2 wavy teal bags, 3 light purple bags.
+drab black bags contain 1 mirrored maroon bag, 3 pale silver bags, 3 dark brown bags, 1 shiny gray bag.
+light blue bags contain 2 dim olive bags, 2 striped magenta bags.
+muted turquoise bags contain 3 dim lime bags, 3 shiny coral bags.
+faded red bags contain 5 clear gray bags.
+bright chartreuse bags contain 4 plaid teal bags, 5 drab salmon bags, 5 wavy cyan bags.
+light magenta bags contain 5 light aqua bags, 4 light crimson bags, 3 dark yellow bags, 1 light tomato bag.
+striped coral bags contain 3 mirrored white bags.
+shiny maroon bags contain 1 vibrant red bag, 3 bright red bags.
+striped yellow bags contain 1 bright orange bag, 2 faded plum bags, 3 light olive bags, 3 shiny aqua bags.
+dull olive bags contain 2 posh fuchsia bags, 2 dull coral bags, 2 faded red bags.
+dotted yellow bags contain 1 drab salmon bag, 3 pale fuchsia bags.
+light bronze bags contain 3 drab cyan bags, 5 mirrored orange bags, 4 plaid crimson bags.
+shiny chartreuse bags contain 1 wavy cyan bag, 4 shiny tomato bags.
+dull yellow bags contain no other bags.
+faded plum bags contain 5 vibrant blue bags, 5 clear indigo bags, 5 posh teal bags, 4 posh plum bags.
+wavy salmon bags contain 4 striped teal bags, 3 wavy tan bags, 1 clear white bag.
+posh salmon bags contain 4 dull chartreuse bags, 4 shiny yellow bags, 2 dotted black bags, 3 clear lime bags.
+dull white bags contain 2 dim olive bags, 4 vibrant bronze bags, 4 faded cyan bags.
+shiny gold bags contain 5 bright maroon bags, 5 shiny aqua bags, 2 clear lime bags, 2 muted white bags.
+posh plum bags contain 4 posh purple bags, 2 wavy beige bags, 5 plaid plum bags.
+shiny magenta bags contain 4 shiny tan bags, 2 dull green bags, 3 mirrored purple bags.
+wavy olive bags contain 4 vibrant olive bags, 2 clear fuchsia bags, 1 light plum bag, 2 dark violet bags.
+muted lime bags contain 4 posh white bags, 4 shiny tomato bags.
+light indigo bags contain 2 clear turquoise bags, 3 vibrant black bags, 3 striped lime bags.
+muted yellow bags contain 3 mirrored tomato bags.
+faded beige bags contain 5 clear red bags, 3 dull brown bags, 4 dark red bags, 1 vibrant magenta bag.
+striped turquoise bags contain 2 bright aqua bags, 5 dim cyan bags, 1 pale lavender bag.
+pale beige bags contain no other bags.
+dull silver bags contain 3 bright lime bags, 2 pale tomato bags, 3 mirrored green bags.
+clear cyan bags contain 1 vibrant blue bag, 2 faded cyan bags, 1 faded brown bag.
+posh green bags contain 2 vibrant gray bags, 1 pale magenta bag.
+muted beige bags contain 2 drab blue bags, 3 vibrant magenta bags, 5 pale tomato bags.
+bright silver bags contain 4 dull brown bags, 4 vibrant violet bags, 4 dim violet bags.
+mirrored bronze bags contain 2 bright indigo bags, 3 shiny coral bags.
+dull red bags contain 4 dull plum bags, 1 striped black bag, 1 dim teal bag, 4 dim white bags.
+dim chartreuse bags contain 3 drab maroon bags.
+drab crimson bags contain 5 dull turquoise bags, 3 posh gold bags, 4 bright gold bags, 2 muted indigo bags.
+wavy brown bags contain 1 muted white bag.
+plaid violet bags contain 2 faded tomato bags.
+muted salmon bags contain 1 light cyan bag, 1 vibrant blue bag.
+mirrored salmon bags contain 1 dotted green bag, 2 plaid salmon bags.
+posh lime bags contain 1 vibrant blue bag.
+shiny tan bags contain 2 bright red bags, 1 dim maroon bag, 3 vibrant salmon bags.
+vibrant aqua bags contain 5 shiny orange bags, 2 dull coral bags, 4 vibrant bronze bags, 5 dark indigo bags.
+posh magenta bags contain 5 dim maroon bags, 2 wavy indigo bags.
+posh red bags contain 4 dull black bags, 2 shiny tomato bags, 4 faded beige bags.
+mirrored indigo bags contain 4 faded magenta bags, 1 light red bag, 3 muted gray bags, 2 plaid lavender bags.
+drab indigo bags contain 4 dull tan bags, 2 dark coral bags.
+vibrant lavender bags contain 5 posh turquoise bags, 4 posh bronze bags, 5 light tomato bags.
+mirrored blue bags contain 1 striped bronze bag, 4 plaid salmon bags, 3 posh lime bags, 4 mirrored green bags.
+plaid blue bags contain 4 bright violet bags, 5 clear red bags.
+dark tan bags contain 3 faded chartreuse bags, 1 posh gold bag, 5 light chartreuse bags.
+bright teal bags contain 3 pale yellow bags, 1 vibrant white bag, 3 shiny salmon bags, 1 plaid indigo bag.
+dark gold bags contain 1 mirrored green bag.
+plaid beige bags contain 5 dim cyan bags.
+pale plum bags contain 4 striped olive bags, 1 mirrored violet bag.
+drab orange bags contain 1 plaid cyan bag, 2 vibrant green bags, 4 striped crimson bags, 2 posh teal bags.
+faded teal bags contain 4 muted salmon bags, 1 dim tomato bag, 5 clear white bags.
+posh cyan bags contain 3 shiny gray bags, 2 posh indigo bags.
+plaid tan bags contain 4 plaid silver bags, 2 dark beige bags, 3 plaid salmon bags, 5 light beige bags.
+muted olive bags contain 5 vibrant salmon bags, 2 dull orange bags.
+muted tan bags contain 5 wavy gold bags, 2 striped orange bags, 4 plaid lavender bags.
+posh tan bags contain 3 shiny lavender bags, 5 vibrant red bags, 4 light bronze bags.
+bright tomato bags contain 3 dull lime bags, 3 wavy gray bags.
+dark turquoise bags contain 3 vibrant coral bags, 4 wavy beige bags.
+faded indigo bags contain 4 wavy gray bags.
+clear blue bags contain 2 pale yellow bags.
+light gold bags contain 5 light olive bags, 4 clear white bags, 3 plaid silver bags, 2 bright maroon bags.
+light lavender bags contain 2 dotted black bags, 4 plaid tomato bags, 4 dark orange bags, 5 shiny blue bags.
+faded coral bags contain 5 pale gold bags, 4 dull black bags.
+vibrant salmon bags contain 2 faded teal bags, 4 drab lavender bags, 5 clear teal bags, 1 dim olive bag.
+muted orange bags contain 1 posh salmon bag, 2 light cyan bags, 5 shiny tomato bags, 4 dim olive bags.
+clear black bags contain 3 wavy bronze bags, 4 wavy lime bags, 4 shiny black bags.
+pale violet bags contain 1 faded violet bag, 3 pale chartreuse bags, 5 drab blue bags.
+dotted plum bags contain 2 muted chartreuse bags, 3 vibrant turquoise bags, 5 posh brown bags.
+plaid maroon bags contain 1 posh coral bag, 1 dull fuchsia bag.
+dotted brown bags contain 1 posh lime bag, 5 dull turquoise bags.
+pale green bags contain 3 drab magenta bags, 4 dim salmon bags, 1 vibrant chartreuse bag.
+dark tomato bags contain 2 clear indigo bags, 1 light plum bag, 2 dull turquoise bags.
+striped silver bags contain 5 dark red bags, 4 faded purple bags.
+shiny fuchsia bags contain 2 dark gold bags, 3 dull tomato bags.
+mirrored aqua bags contain 5 dark bronze bags.
+dim beige bags contain 5 dull white bags.
+dark chartreuse bags contain 4 light crimson bags, 3 dim salmon bags, 2 dark orange bags.
+plaid chartreuse bags contain 4 drab blue bags.
+dim green bags contain 4 muted bronze bags, 1 shiny indigo bag.
+mirrored crimson bags contain 5 wavy fuchsia bags, 2 vibrant magenta bags.
+clear yellow bags contain 3 plaid bronze bags, 1 light tan bag.
+bright turquoise bags contain 3 shiny salmon bags.
+drab brown bags contain 1 vibrant fuchsia bag.
+dim bronze bags contain 2 dim aqua bags, 4 dim beige bags.
+dim black bags contain 1 posh purple bag, 4 mirrored bronze bags, 5 posh plum bags.
+plaid gold bags contain 4 posh silver bags, 5 light turquoise bags, 3 vibrant black bags.
+drab lime bags contain 1 muted gold bag, 4 dotted red bags.
+bright red bags contain 1 dull yellow bag, 4 mirrored gold bags.
+vibrant white bags contain 2 dull lime bags, 2 faded indigo bags, 1 faded brown bag, 1 muted salmon bag.
+drab fuchsia bags contain 3 pale beige bags, 3 dark orange bags.
+striped tomato bags contain 1 dark lime bag, 5 dull coral bags.
+faded green bags contain 2 wavy blue bags.
+vibrant olive bags contain 3 bright tomato bags, 4 wavy beige bags.
+dark coral bags contain 5 faded teal bags, 1 mirrored tomato bag, 3 dark orange bags, 5 plaid lime bags.
+bright violet bags contain 4 dark lime bags.
+wavy tan bags contain 4 light tan bags, 3 vibrant red bags, 2 mirrored olive bags.
+dotted beige bags contain 5 striped gray bags, 4 posh plum bags, 1 bright turquoise bag, 4 striped fuchsia bags.
+dotted turquoise bags contain 3 mirrored green bags, 4 posh gold bags, 5 drab plum bags.
+striped beige bags contain 1 clear gold bag, 1 vibrant white bag, 3 faded cyan bags, 2 shiny gold bags.
+posh silver bags contain 2 vibrant gold bags, 2 mirrored violet bags.
+mirrored purple bags contain 2 dim yellow bags, 2 dull tomato bags.
+shiny lime bags contain 4 clear olive bags, 4 mirrored silver bags, 1 muted tomato bag.
+muted cyan bags contain 1 posh coral bag, 5 drab blue bags, 4 wavy lavender bags.
+light aqua bags contain 1 dark orange bag.
+shiny cyan bags contain 2 dark maroon bags, 5 shiny salmon bags, 5 muted salmon bags, 2 wavy bronze bags.
+posh white bags contain 1 posh fuchsia bag.
+vibrant plum bags contain 4 light crimson bags.
+dotted blue bags contain 1 shiny tan bag, 3 light plum bags, 5 dotted gray bags.
+posh maroon bags contain 5 mirrored violet bags.
+dull violet bags contain 1 faded teal bag, 2 wavy cyan bags, 3 dull silver bags, 3 vibrant red bags.
+posh gold bags contain 4 muted salmon bags, 4 dull plum bags, 3 muted bronze bags.
+dim orange bags contain 2 dull coral bags.
+dim aqua bags contain 1 drab maroon bag.
+striped salmon bags contain 4 muted white bags.
+dark cyan bags contain 3 plaid maroon bags.
+wavy red bags contain 2 wavy maroon bags, 2 vibrant chartreuse bags, 5 wavy salmon bags.
+light yellow bags contain 4 posh lime bags, 1 light white bag.
+striped blue bags contain 5 plaid magenta bags, 5 vibrant gold bags.
+dark olive bags contain 4 dim maroon bags, 2 shiny tan bags, 5 wavy green bags.
+vibrant gold bags contain 1 dull beige bag, 4 posh turquoise bags.
+muted white bags contain 1 dim indigo bag, 5 dull lime bags, 5 shiny aqua bags.
+light violet bags contain 5 wavy bronze bags.
+pale olive bags contain 1 dim gold bag, 2 shiny coral bags.
+light gray bags contain 3 bright gold bags.
+dim indigo bags contain 3 posh tomato bags, 5 pale tomato bags, 4 shiny aqua bags.
+pale indigo bags contain 4 pale bronze bags, 5 light chartreuse bags.
+muted red bags contain 3 clear white bags, 4 dull lavender bags, 5 muted purple bags.
+plaid olive bags contain 3 dark orange bags, 3 dim gold bags.
+dotted maroon bags contain 3 faded purple bags, 5 light green bags.
+bright orange bags contain 1 shiny black bag, 2 dim lavender bags, 1 shiny olive bag.
+wavy chartreuse bags contain 3 clear lime bags, 4 pale maroon bags.
+mirrored turquoise bags contain 2 striped crimson bags, 4 vibrant bronze bags, 5 dotted lavender bags, 2 clear silver bags.
+dull purple bags contain 4 posh crimson bags.
+faded bronze bags contain 1 clear fuchsia bag, 2 light fuchsia bags, 2 pale chartreuse bags.
+clear bronze bags contain 3 pale chartreuse bags, 5 dull tan bags, 1 vibrant tan bag.
+vibrant magenta bags contain 4 shiny fuchsia bags, 2 shiny coral bags, 3 faded indigo bags, 4 pale tomato bags.
+striped chartreuse bags contain 2 shiny orange bags, 3 mirrored tomato bags, 1 clear lime bag.
+dotted green bags contain 1 pale beige bag, 2 mirrored bronze bags, 2 wavy crimson bags.
+wavy white bags contain 3 posh magenta bags, 3 muted yellow bags, 3 wavy crimson bags, 4 vibrant olive bags.
+muted plum bags contain 4 wavy gold bags.
+faded violet bags contain 3 dark violet bags.
+dull fuchsia bags contain 4 plaid indigo bags, 1 mirrored brown bag, 5 clear lime bags.
+bright green bags contain 3 mirrored white bags, 5 dotted silver bags.
+shiny violet bags contain 4 striped salmon bags.
+dim fuchsia bags contain 3 striped red bags.
+faded lavender bags contain 3 wavy tan bags, 2 clear lime bags.
+dim cyan bags contain 4 drab white bags.
+dark brown bags contain 5 clear gold bags, 3 vibrant blue bags.
+clear lavender bags contain 5 striped turquoise bags, 1 light crimson bag, 5 light tan bags, 2 muted gold bags.
+light green bags contain 3 striped silver bags, 4 bright silver bags, 2 light crimson bags.
+pale lavender bags contain 5 clear violet bags.
+dotted orange bags contain 3 dotted tomato bags, 2 dull plum bags, 5 posh purple bags, 2 drab turquoise bags.
+bright black bags contain 3 posh chartreuse bags, 5 wavy indigo bags, 5 dull crimson bags, 2 clear turquoise bags.
+dotted gold bags contain 5 striped white bags, 2 striped brown bags, 3 mirrored green bags, 3 dark violet bags.
+plaid brown bags contain 3 striped chartreuse bags, 3 striped black bags, 2 bright chartreuse bags.
+wavy coral bags contain 3 dim turquoise bags, 4 dim lime bags.
+pale brown bags contain 4 dim white bags, 5 bright fuchsia bags, 2 clear orange bags.
+mirrored teal bags contain 4 pale lavender bags, 5 vibrant maroon bags, 4 striped gray bags, 4 vibrant indigo bags.
+posh orange bags contain 5 posh magenta bags, 4 posh violet bags, 2 plaid magenta bags, 4 muted cyan bags.
+dim crimson bags contain 3 drab violet bags, 1 dotted aqua bag.
+muted gray bags contain 4 vibrant lime bags, 1 dark maroon bag, 2 clear gold bags, 3 plaid gray bags.
+clear brown bags contain 5 shiny tomato bags, 4 striped tan bags, 5 vibrant lavender bags, 1 pale white bag.
+posh crimson bags contain 3 dim yellow bags, 4 shiny turquoise bags, 2 vibrant purple bags, 4 mirrored aqua bags.
+plaid black bags contain 2 shiny tan bags, 1 pale olive bag, 2 wavy tan bags, 1 clear red bag.
+dark crimson bags contain 3 drab fuchsia bags, 5 faded gold bags.
+pale tan bags contain 5 posh black bags.
+wavy bronze bags contain 1 clear lime bag.
+wavy gold bags contain 2 dull lavender bags, 1 bright turquoise bag, 4 striped brown bags, 5 drab turquoise bags.
+pale lime bags contain 2 faded cyan bags, 4 muted salmon bags, 4 shiny coral bags, 3 mirrored green bags.
+dark magenta bags contain 4 faded chartreuse bags, 1 muted brown bag, 4 vibrant salmon bags, 2 dim indigo bags.
+striped purple bags contain 3 mirrored olive bags.
+dull crimson bags contain 2 clear orange bags.
+dull beige bags contain 1 drab turquoise bag, 1 dark indigo bag, 1 dull white bag.
+dotted aqua bags contain 4 dull chartreuse bags.
+clear purple bags contain 2 muted beige bags, 3 dull black bags.
+light crimson bags contain 1 faded brown bag, 1 vibrant red bag, 4 wavy lavender bags, 1 wavy gray bag.
+clear fuchsia bags contain 1 dark maroon bag, 3 muted salmon bags.
+muted crimson bags contain 5 light lime bags, 4 posh plum bags, 5 clear fuchsia bags, 1 wavy turquoise bag.
+muted purple bags contain 3 dull gray bags, 5 posh gray bags.
+shiny salmon bags contain 5 faded brown bags, 4 clear chartreuse bags.
+plaid lavender bags contain 1 dim lime bag.
+vibrant indigo bags contain 5 dim tomato bags, 2 striped beige bags, 2 mirrored olive bags.
+mirrored cyan bags contain 3 plaid coral bags, 5 faded teal bags, 5 pale indigo bags, 3 bright fuchsia bags.
+dim yellow bags contain 5 light crimson bags, 1 pale tomato bag.
+dotted chartreuse bags contain 3 shiny blue bags.
+light beige bags contain 3 bright teal bags, 1 pale tomato bag, 2 light blue bags.
+dotted olive bags contain 3 bright indigo bags, 4 muted fuchsia bags.
+pale white bags contain 1 vibrant maroon bag, 2 pale tomato bags, 2 bright magenta bags.
+mirrored yellow bags contain 2 drab brown bags, 3 striped salmon bags, 4 clear olive bags, 1 dotted black bag.
+light olive bags contain 2 bright magenta bags.
+muted tomato bags contain 4 shiny lavender bags.
+light chartreuse bags contain 5 light plum bags, 4 light olive bags, 3 dark indigo bags.
+posh purple bags contain 2 wavy crimson bags.
+bright maroon bags contain 4 faded indigo bags.
+dull blue bags contain 3 dark brown bags, 3 dim indigo bags, 5 pale silver bags, 1 mirrored brown bag.
+light coral bags contain 5 clear teal bags.
+bright gray bags contain 3 muted black bags, 3 vibrant cyan bags.
+posh fuchsia bags contain 3 clear gold bags, 1 dim salmon bag, 2 shiny salmon bags.
+light white bags contain 3 dim cyan bags, 5 clear crimson bags, 3 dull fuchsia bags.
+light teal bags contain 3 shiny fuchsia bags, 2 muted white bags, 3 shiny black bags.
+plaid salmon bags contain 2 dotted black bags, 2 dark beige bags, 1 shiny coral bag.
+wavy black bags contain 5 posh olive bags.
+drab gray bags contain 3 mirrored tomato bags, 3 light crimson bags.
+dim olive bags contain 5 clear chartreuse bags.
+bright white bags contain 2 mirrored tan bags, 1 pale green bag, 5 dull magenta bags, 5 plaid lime bags.
+striped olive bags contain 3 muted gold bags.
+faded olive bags contain 1 muted indigo bag.
+pale yellow bags contain 5 light olive bags, 5 plaid aqua bags, 1 clear white bag, 5 faded purple bags.
+dull coral bags contain 4 light crimson bags, 5 shiny aqua bags, 5 wavy cyan bags, 3 dark beige bags.
+vibrant beige bags contain 4 striped olive bags, 5 clear gold bags.
+dark fuchsia bags contain 1 pale teal bag, 4 dull gray bags.
+drab tomato bags contain 4 mirrored white bags.
+clear crimson bags contain 4 pale tomato bags, 3 wavy gray bags, 4 drab blue bags, 1 mirrored olive bag.
+dotted crimson bags contain 1 plaid crimson bag, 1 dark crimson bag, 1 striped beige bag, 4 pale fuchsia bags.
+striped black bags contain 4 muted maroon bags.
+shiny bronze bags contain 1 dotted tan bag, 1 vibrant beige bag, 5 faded tomato bags.
+light cyan bags contain no other bags.
+posh black bags contain 2 dim green bags.
+striped gold bags contain 3 drab tan bags.
+faded white bags contain 4 pale coral bags.
+drab tan bags contain 4 clear gold bags, 5 drab silver bags.
+light tan bags contain 2 dull lime bags, 1 muted salmon bag, 4 pale beige bags.
+plaid indigo bags contain 3 plaid salmon bags, 1 vibrant maroon bag.
+faded gold bags contain 3 dark coral bags.
+dark salmon bags contain 5 bright gold bags, 1 pale white bag.
+plaid bronze bags contain 3 drab gold bags, 4 dotted black bags.
+shiny black bags contain 3 bright magenta bags, 2 dark indigo bags, 1 posh plum bag, 5 drab gold bags.
+pale magenta bags contain 1 clear gold bag, 5 posh fuchsia bags, 2 faded cyan bags.
diff --git a/2020/day8/day8.py b/2020/day8/day8.py
new file mode 100644
index 0000000..81ed6f0
--- /dev/null
+++ b/2020/day8/day8.py
@@ -0,0 +1,49 @@
+#! /usr/bin/env python3
+
+
+def part1(instructions):
+    instruction_pointer = 0
+    accumulator = 0
+    visited_instructions = set()
+    while instruction_pointer not in visited_instructions:  # return before executing any instruction a second time
+        if instruction_pointer >= len(instructions):  # stop the program when ip is out of bounds
+            break
+        visited_instructions.add(instruction_pointer)
+        instruction, argument = instructions[instruction_pointer].split(" ")
+        if instruction == "acc":
+            accumulator += int(argument)
+            instruction_pointer += 1
+        elif instruction == "jmp":
+            value = int(argument)
+            instruction_pointer += value
+        else:
+            instruction_pointer += 1
+    return instruction_pointer, accumulator
+
+
+def part2(instructions):
+    for index, line in enumerate(instructions):
+        permutation = generate_permutation(instructions, line, index)
+        if permutation is None:
+            continue
+        instruction_pointer, accumulator = part1(permutation)
+        if instruction_pointer == len(permutation):
+            return accumulator
+
+
+def generate_permutation(instructions, line, index):
+    permutation = instructions[:]
+    instruction, arg = line.split(" ")
+    if instruction == "acc":  # don't replace acc operations
+        return
+    elif instruction == "nop":
+        permutation[index] = f"jmp {arg}"
+    elif instruction == "jmp":
+        permutation[index] = f"nop {arg}"
+    return permutation
+
+
+if __name__ == "__main__":
+    instructions = [line.rstrip() for line in open("input.txt")]
+    print("Part 1 : (ip, acc) ", part1(instructions)[1])
+    print("Part 2 : (ip, acc) ", part2(instructions))
diff --git a/2020/day8/input.txt b/2020/day8/input.txt
new file mode 100644
index 0000000..5b247e0
--- /dev/null
+++ b/2020/day8/input.txt
@@ -0,0 +1,608 @@
+jmp +232
+acc +21
+nop +120
+jmp +239
+acc +18
+acc +41
+jmp +72
+acc +47
+jmp +314
+jmp +1
+acc +47
+nop +175
+acc +33
+jmp +115
+nop -5
+acc +37
+acc +25
+acc +18
+jmp +304
+acc +0
+acc +16
+jmp +77
+acc +9
+acc -3
+jmp +93
+acc +16
+acc -15
+jmp +110
+jmp +76
+acc +36
+acc +11
+acc -3
+jmp +258
+jmp +241
+acc +42
+jmp +514
+nop +103
+acc +36
+acc -18
+jmp +47
+acc +5
+acc +37
+jmp +480
+acc -16
+jmp +1
+nop +498
+jmp +1
+jmp +12
+acc +0
+acc +35
+jmp +437
+jmp +326
+acc -15
+acc -7
+nop -2
+jmp +548
+jmp -4
+jmp +395
+jmp +258
+acc +37
+acc +17
+acc -18
+jmp +345
+acc -18
+acc +37
+acc +36
+jmp +217
+acc -4
+acc +39
+jmp -35
+jmp +252
+jmp +1
+nop +91
+jmp +402
+nop -40
+jmp +371
+jmp -72
+jmp +9
+acc +41
+jmp +95
+nop +252
+nop +30
+jmp +240
+nop +266
+jmp +462
+jmp +137
+acc -14
+jmp +203
+jmp +1
+acc +45
+acc -14
+acc -6
+jmp -9
+acc -15
+acc +6
+nop +298
+jmp -56
+jmp +14
+acc +32
+jmp +40
+acc +17
+nop +62
+acc +14
+jmp +119
+acc +49
+jmp -29
+acc +27
+acc -12
+acc +14
+acc +19
+jmp +253
+acc +19
+jmp +345
+acc -17
+acc +39
+jmp +1
+jmp +133
+jmp +268
+acc -14
+acc -16
+acc +45
+jmp +373
+jmp +116
+jmp +245
+acc -19
+acc +32
+jmp -22
+jmp +105
+acc -9
+acc +27
+acc +16
+nop +397
+jmp +110
+acc +13
+acc -10
+acc +10
+jmp -69
+jmp +29
+jmp +94
+acc +38
+acc +49
+acc +40
+jmp +261
+acc +43
+acc -13
+jmp +214
+acc -10
+nop -80
+acc +15
+jmp +228
+acc +0
+jmp +275
+jmp -69
+acc +46
+acc +4
+acc +24
+acc +6
+jmp +279
+acc -9
+nop +281
+jmp +286
+acc -4
+jmp +306
+jmp +342
+acc -14
+jmp +357
+acc -10
+nop -9
+acc +10
+acc +40
+jmp +427
+acc +0
+acc +32
+jmp +405
+acc +45
+acc +34
+nop +281
+acc +34
+jmp +394
+acc +41
+acc +20
+jmp -98
+jmp -60
+acc -3
+acc +17
+jmp +19
+acc +6
+nop +168
+acc +35
+jmp -141
+nop -62
+acc +8
+acc +16
+jmp +117
+acc +34
+acc -8
+acc +35
+acc -15
+jmp +85
+acc +2
+acc -9
+acc -4
+acc +49
+jmp +394
+nop -145
+acc +47
+jmp +16
+acc +10
+acc +0
+jmp +87
+nop -88
+acc -9
+acc -16
+acc +45
+jmp +374
+acc +28
+acc +38
+jmp -139
+acc -13
+acc +13
+jmp +143
+jmp -135
+jmp -4
+jmp -130
+acc +5
+nop -196
+jmp +48
+acc -10
+jmp +149
+acc -14
+jmp +210
+jmp +325
+acc +45
+acc +11
+acc -15
+jmp +97
+nop +107
+jmp -98
+acc -7
+acc -18
+jmp -181
+jmp +122
+acc -15
+jmp -49
+jmp +1
+acc +36
+acc -10
+jmp +1
+jmp +62
+acc +39
+jmp +105
+acc +19
+nop +253
+acc -11
+acc -9
+jmp +77
+acc +50
+acc +3
+acc -18
+acc +17
+jmp +56
+nop -209
+nop +272
+acc -13
+jmp +270
+nop +229
+acc +12
+jmp +1
+jmp -44
+acc -13
+jmp +1
+nop +275
+acc +45
+jmp -254
+acc -2
+acc -2
+nop -148
+jmp -91
+acc +2
+nop -30
+acc -8
+acc +0
+jmp -96
+nop +1
+jmp -74
+acc -19
+acc +10
+acc +26
+acc +30
+jmp -280
+acc +46
+acc -2
+acc -8
+jmp +277
+acc -9
+jmp +205
+acc -13
+acc +10
+jmp +1
+jmp +219
+acc +38
+acc +24
+acc +11
+jmp -129
+jmp -86
+jmp +1
+acc +0
+jmp +1
+acc +46
+jmp -135
+nop +218
+acc -14
+acc +0
+jmp +55
+acc +24
+jmp +213
+acc +19
+acc +16
+jmp -266
+acc +24
+acc +15
+jmp +158
+acc +3
+jmp -94
+acc +16
+acc +24
+acc +42
+jmp +201
+jmp -32
+acc +34
+nop -321
+jmp +212
+acc +12
+acc +41
+jmp -212
+acc +32
+jmp +236
+acc +45
+nop +253
+jmp +129
+nop -3
+acc +38
+jmp +35
+acc -15
+acc +21
+acc -7
+acc -6
+jmp +46
+jmp -5
+acc +5
+acc +4
+acc +42
+jmp +142
+acc +36
+jmp -180
+acc +23
+jmp -46
+acc +12
+jmp +5
+jmp +201
+acc +36
+acc -14
+jmp -30
+jmp -338
+acc +12
+acc +34
+acc +2
+jmp -310
+acc -15
+jmp -104
+jmp -148
+jmp +108
+acc +37
+acc -6
+acc +0
+acc +13
+jmp -324
+acc +49
+acc +37
+acc +37
+jmp +131
+acc +2
+acc +30
+acc +12
+jmp -238
+acc -12
+acc +4
+jmp -155
+acc +45
+acc -10
+nop -168
+nop +114
+jmp +113
+acc +15
+acc +41
+acc +6
+acc +34
+jmp +25
+acc +46
+acc +28
+acc +44
+acc -3
+jmp -70
+acc +2
+acc +37
+jmp -101
+jmp +51
+acc +45
+nop -399
+nop -60
+jmp -391
+acc +41
+jmp -57
+jmp -54
+acc +46
+jmp +90
+acc +6
+jmp +83
+acc +37
+jmp +1
+acc -6
+jmp -189
+acc +0
+jmp -241
+acc +35
+jmp -396
+acc +35
+acc +42
+acc +37
+acc +20
+jmp -81
+nop +74
+acc +41
+acc +23
+jmp +1
+jmp -349
+jmp -232
+acc +37
+acc +24
+jmp +121
+jmp -144
+acc +35
+acc +39
+acc -12
+acc +14
+jmp -113
+acc +2
+acc +29
+acc -6
+acc +0
+jmp -326
+jmp -426
+acc +18
+acc +39
+acc +22
+jmp +79
+jmp +23
+acc -17
+nop +42
+acc -8
+jmp -47
+acc -12
+jmp -276
+jmp -126
+acc +20
+acc +3
+acc +41
+jmp -31
+acc -1
+jmp +1
+jmp -241
+acc +9
+acc +12
+acc +0
+jmp +26
+acc +30
+nop +46
+jmp -134
+jmp -361
+acc +50
+nop -1
+nop -225
+jmp -226
+acc +42
+acc +0
+jmp +1
+jmp -170
+acc +14
+acc +19
+jmp -199
+nop +15
+acc -11
+acc +20
+jmp -161
+nop -348
+acc -6
+acc +49
+jmp -468
+acc +11
+jmp -413
+acc -11
+acc -1
+acc +45
+jmp -181
+jmp -380
+nop -128
+acc +40
+jmp -179
+acc -9
+acc +24
+jmp -358
+acc +50
+acc +13
+acc -15
+jmp +14
+acc +4
+acc +12
+jmp -365
+nop -269
+jmp -443
+nop -224
+jmp -108
+acc +46
+acc -11
+jmp -515
+acc -8
+nop -284
+jmp -444
+acc +15
+nop -11
+jmp -288
+acc +28
+acc +35
+jmp -416
+acc +27
+acc -8
+acc -10
+acc +0
+jmp -167
+acc -9
+acc +42
+acc +20
+jmp -63
+jmp -107
+acc -6
+jmp -335
+jmp -460
+acc -2
+jmp -420
+acc +27
+acc +6
+jmp -458
+acc +31
+nop +19
+nop -396
+jmp -479
+nop -234
+acc +42
+jmp -142
+jmp -511
+nop +28
+acc -9
+acc +36
+acc +38
+jmp +27
+acc -3
+acc +9
+acc -19
+acc +3
+jmp -133
+jmp -503
+jmp -267
+acc +40
+acc +41
+acc +13
+nop -492
+jmp -327
+jmp -339
+acc +17
+acc +4
+acc +45
+acc +13
+jmp -419
+acc +31
+acc +0
+acc +37
+acc -13
+jmp -210
+jmp -517
+acc -15
+jmp -47
+acc -16
+jmp -129
+acc +16
+nop -455
+nop -263
+jmp -74
+acc +5
+acc +20
+acc +45
+acc +23
+jmp -490
+jmp -53
+acc +40
+jmp +1
+acc -14
+acc -1
+jmp +1
\ No newline at end of file
diff --git a/2020/day9/day9.py b/2020/day9/day9.py
new file mode 100644
index 0000000..2c739fe
--- /dev/null
+++ b/2020/day9/day9.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+import itertools
+
+
+def part1(inp):
+    preamble_size = 25
+    with open(inp) as infile:
+        cleanfile = (int(l.rstrip()) for l in infile)
+        for nums in window(cleanfile, preamble_size + 1):
+            candidate = nums[-1]
+            if not test_number(candidate, nums[:-1]):
+                return candidate
+    return -1
+
+
+def window(seq, n):
+    it = iter(seq)
+    result = tuple(itertools.islice(it, n))
+    if len(result) == n:
+        yield result
+    for elem in it:
+        result = result[1:] + (elem,)
+        yield result
+
+
+def test_number(num, previous):
+    sums = set(sum(x) for x in itertools.combinations(previous, 2))
+    return num in sums
+
+
+def part2(infile, target: int):
+    lines = [int(l.rstrip()) for l in open(infile).readlines()]
+    total = 0
+    visited = []
+    for index, _ in enumerate(lines):
+        i = index
+        while total < target:
+            total += lines[i]
+            visited.append(lines[i])
+            i += 1
+            if total == target:
+                return max(visited) + min(visited)
+        visited.clear()
+        total = 0
+
+
+if __name__ == "__main__":
+    invalid_number = part1("input.txt")
+    print("part1 ", invalid_number)
+    print("part2 ", part2("input.txt", invalid_number))
diff --git a/2020/day9/input.txt b/2020/day9/input.txt
new file mode 100644
index 0000000..20f8901
--- /dev/null
+++ b/2020/day9/input.txt
@@ -0,0 +1,1000 @@
+16
+19
+41
+7
+20
+3
+45
+40
+37
+25
+5
+22
+43
+48
+4
+23
+18
+47
+28
+11
+10
+42
+35
+6
+34
+21
+8
+9
+12
+7
+13
+38
+14
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+16
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+20
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+60
+22
+24
+27
+46
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+91
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