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day 3 part 1

This commit is contained in:
Thibaud Gasser 2023-12-03 11:32:47 +01:00
parent 1bb8dff1ac
commit 0aec5c1a70
4 changed files with 243 additions and 12 deletions

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@ -12,12 +12,11 @@ def part1(lines):
colors = {"red": 0, "green": 0, "blue": 0}
cubes = hand.split(", ")
for cube in cubes:
_, n, color = cube.split(" ")
n, color = cube.split()
colors[color] = int(n)
if colors["red"] > 12 or colors["green"] > 13 or colors["blue"] > 14:
# impossible configuration, remove this game_id from the result
if int(game_id) in result:
result.remove(int(game_id))
# impossible configuration, remove this game_id from the result (if present)
result.discard(int(game_id))
print(f"Part 1: {sum(result)}")
@ -26,11 +25,11 @@ def part2(lines):
for line in lines:
colors = {"red": 0, "green": 0, "blue": 0}
_, line = line.split(": ")
sets = line.rstrip().split(";")
for s in sets:
cubes = s.split(",")
hands = line.rstrip().split("; ")
for hand in hands:
cubes = hand.split(", ")
for cube in cubes:
_, n, color = cube.split(" ")
n, color = cube.split()
colors[color] = max(colors[color], int(n))
result.append(prod(colors.values()))
print(f"Part 2: {sum(result)}")

82
day3/day3.py Normal file
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@ -0,0 +1,82 @@
from typing import Tuple, List
def browse_schema(schema):
total_parts = 0
buf = []
max_row, max_col = len(schema), len(schema[0])
for y in range(max_row):
for x in range(max_col):
item = schema[y][x]
if item.isnumeric():
# continue parsing full number
buf.append(item)
elif buf:
# end of a number, do the engine part check
if buf:
neighbors = get_neighbors((x, y), len(buf), schema)
if is_engine_part(neighbors):
part_number = int("".join(buf))
total_parts += part_number
buf.clear() # reached end of a number, clear buffer
print(f"Part 1, sum of the parts numbers = {total_parts}")
print(f"Part 2, sum of the gear ratios = TODO")
def is_engine_part(neighbors: List[str]) -> bool:
# get list of symbols (not '.', \n or a number)
symbols = filter(lambda x: not x.isnumeric() and not x in (".", "\n"), neighbors)
return next(symbols, None) is not None
def get_neighbors(pos: Tuple[int, int], length: int, schema: List[List[str]]) -> List[str]:
x, y = pos
start_x = x - length
neighbors = [get_neighbors_of_digit((x, y), schema) for x in range(start_x, x)]
neighbors = [item for sublist in neighbors for item in sublist] # flatten list of list
return neighbors
def get_neighbors_of_digit(pos: Tuple[int, int], schema: List[List[str]]) -> List[str]:
max_row, max_col = len(schema), len(schema[0])
x, y = pos
neighbors = []
# top
if y-1 >= 0:
neighbors.append(schema[y-1][x])
# bottom:
if y+1 < max_row:
neighbors.append(schema[y+1][x])
# left
if x-1 >= 0:
neighbors.append(schema[y][x-1])
# right
if x+1 < max_col:
neighbors.append(schema[y][x+1])
# top-left
if y-1 >= 0 and x-1 >= 0:
neighbors.append(schema[y-1][x-1])
# top-right
if y-1 >= 0 and x+1 < max_col:
neighbors.append(schema[y-1][x+1])
# bottom-left
if y+1 < max_row and x-1 >= 0:
neighbors.append(schema[y+1][x-1])
# bottom-right
if y+1 < max_row and x+1 < max_col:
neighbors.append(schema[y+1][x+1])
return neighbors
if __name__ == "__main__":
import sys
infile = sys.argv[1]
with open(infile) as f:
schema = [[c for c in line] for line in f.readlines()]
browse_schema(schema)

10
day3/example.txt Normal file
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@ -0,0 +1,10 @@
467..114..
...*......
..35..633.
......#...
617*......
.....+.58.
..592.....
......755.
...$.*....
.664.598..

140
day3/input.txt Normal file
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@ -0,0 +1,140 @@
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...*..982.....657..70=..948#..159..777../.....757....................816...............887.............325........*....................871..
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.......10............604.....287...66......507..........917...585............-.......6.327..-......822.....718.....*.......825.......34.....
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....=......176..........................*.=..........................%1.....397*...........820.........407...............21...........*.....
...913...........&............408.....135.300..............775...993.........................@..............%.....272...........*626...101..
..................95..505......*.................581.........+...*...........59*23.......449.......964...657.......*..........75............
.............................87...622..........................822...............................................215.............810........