From 0bee46a0adf811fdd3b25b72fe353e3d5fcebbb3 Mon Sep 17 00:00:00 2001
From: Thibaud <thibaud.gasser@gmx.com>
Date: Wed, 13 May 2026 18:09:00 +0200
Subject: [PATCH] solve some days

---
 .gitignore                       |  3 +-
 adventofcode/2015/day12/day12.py | 44 ++++++++++++++++++
 adventofcode/2015/day2/day2.py   | 28 ++++++++++++
 adventofcode/2015/day5/day5.py   | 78 ++++++++++++++++++++++++++++++++
 4 files changed, 152 insertions(+), 1 deletion(-)
 create mode 100644 adventofcode/2015/day12/day12.py
 create mode 100644 adventofcode/2015/day2/day2.py
 create mode 100644 adventofcode/2015/day5/day5.py

diff --git a/.gitignore b/.gitignore
index 4b6f247..74d63ab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,6 +55,8 @@ coverage.xml
 .hypothesis/
 .pytest_cache/
 
+.ruff_cache/
+
 # Translations
 *.mo
 *.pot
@@ -131,4 +133,3 @@ dmypy.json
 
 # Pyre type checker
 .pyre/
-
diff --git a/adventofcode/2015/day12/day12.py b/adventofcode/2015/day12/day12.py
new file mode 100644
index 0000000..af1e7aa
--- /dev/null
+++ b/adventofcode/2015/day12/day12.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+
+import json
+import re
+from collections import deque
+
+
+def main(inp):
+    total = sum(map(int, re.findall(r"(-?\d+)", inp)))
+    print("Part 1: ", total)
+    root = json.loads(inp)
+    print("Part 2: ", bfs(root))
+
+
+def bfs(json_data):
+    """
+    BFS on the json data and sum all the numbers. If a node contains the value
+    "red", we skip it and all its children
+    """
+    queue = deque([(json_data, "")])  # (node, path)
+    visited = set()
+    total = 0
+    while queue:
+        node, path = queue.popleft()
+        if path not in visited:
+            visited.add(path)
+            if isinstance(node, int):
+                total += node
+            elif isinstance(node, dict):
+                has_red = "red" in node.values()
+                if not has_red:
+                    for key, child in node.items():
+                        queue.append((child, f"{path}.{key}"))
+            elif isinstance(node, list):
+                for idx, child in enumerate(node):
+                    queue.append((child, f"{path}[{idx}]"))
+    return total
+
+
+if __name__ == "__main__":
+    import fileinput
+
+    line = next(fileinput.input()).rstrip()
+    main(line)
diff --git a/adventofcode/2015/day2/day2.py b/adventofcode/2015/day2/day2.py
new file mode 100644
index 0000000..4e0f536
--- /dev/null
+++ b/adventofcode/2015/day2/day2.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+from functools import reduce
+from operator import mul
+
+
+def part1(inp):
+    total = 0
+    for line in inp:
+        l, w, h = map(int, line.split("x"))
+        faces = [l * w, w * h, h * l]
+        total += sum(2 * x for x in faces) + min(faces)
+    print("Part 1: ", total)
+
+
+def part2(inp):
+    total = 0
+    for line in inp:
+        line = list(map(int, line.split("x")))
+        total += sum(sorted(line)[:2]) * 2 + reduce(mul, line, 1)
+    print("Part 2:", total)
+
+
+if __name__ == "__main__":
+    import fileinput
+
+    lines = [x.rstrip() for x in fileinput.input()]
+    part1(lines)
+    part2(lines)
diff --git a/adventofcode/2015/day5/day5.py b/adventofcode/2015/day5/day5.py
new file mode 100644
index 0000000..8493b19
--- /dev/null
+++ b/adventofcode/2015/day5/day5.py
@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+from itertools import islice
+
+VOWELS = "aeiou"
+BAD = ["ab", "cd", "pq", "xy"]
+
+
+def window(seq, n=3):
+    "Returns a sliding window (of width n) over data from the iterable"
+    "   s -> (s0,s1,...s[n-1]), (s1,s2,...,sn), ...                   "
+    it = iter(seq)
+    result = tuple(islice(it, n))
+    if len(result) == n:
+        yield result
+    for elem in it:
+        result = result[1:] + (elem,)
+        yield result
+
+
+def part1(inp):
+    total = 0
+    for line in inp:
+        """
+        - It contains at least three vowels (aeiou only), like aei, xazegov, or
+        aeiouaeiouaeiou.
+        - It contains at least one letter that appears twice in a row, like xx,
+        abcdde (dd), or aabbccdd (aa, bb, cc, or dd).
+        - It does not contain the strings ab, cd, pq, or xy, even if they are
+        part of one of the other requirements.
+        """
+        if any(x in line for x in BAD) or sum(1 for x in line if x in VOWELS) < 3:
+            continue
+        total += any(a == b for a, b in zip(line, line[1:]))
+    print("Part 1: ", total)
+
+
+def part2(inp):
+    """
+    - It contains a pair of any two letters that appears at least twice in the
+    string without overlapping, like xyxy (xy) or aabcdefgaa (aa), but not like
+    aaa (aa, but it overlaps).
+    - It contains at least one letter which repeats with exactly one letter
+    between them, like xyx, abcdefeghi (efe), or even aaa.
+    """
+    total = 0
+    for line in inp:
+        has_repeat = False
+        for triplet in window(line, n=3):
+            if triplet[0] == triplet[2]:
+                has_repeat = True
+                break
+
+        seen_pairs = set()
+        has_pair = False
+        prev_pair = None
+        for pair in window(line, n=2):
+            if pair in seen_pairs:
+                has_pair = True
+            else:
+                # Add the previous pair to avoid overlapping
+                if prev_pair is not None:
+                    seen_pairs.add(prev_pair)
+            prev_pair = pair
+            if has_pair and has_repeat:
+                break  # Early exit when both conditions are met
+
+        if has_pair and has_repeat:
+            total += 1
+
+    print("Part 2: ", total)
+
+
+if __name__ == "__main__":
+    import fileinput
+
+    lines = [x.rstrip() for x in fileinput.input()]
+    part1(lines)
+    part2(lines)