AOC 2024 03

Signed-off-by: GitHub <noreply@github.com>

Author: shenanigansd

events/advent_of_code/2024/03/python/aoc_2024_03.py

@@ -0,0 +1,32 @@
+import re
+from math import prod
+from pathlib import Path
+
+
+def part1(text: str) -> int:
+    return sum(int(x) * int(y) for x, y in re.findall(r"mul\((\d{1,3}),(\d{1,3})\)", text, re.MULTILINE))
+
+
+def part2(text: str) -> int:
+    do_indexes = [match.start(0) for match in re.finditer(r"do\(\)", text)]
+    dont_indexes = [match.start(0) for match in re.finditer(r"don't\(\)", text)]
+    map_ = [True] * len(text)
+    in_do = True
+    for counter in range(len(map_)):
+        if counter in do_indexes:
+            in_do = True
+        elif counter in dont_indexes:
+            in_do = False
+        else:
+            pass
+        map_[counter] = in_do
+
+    return sum(
+        prod(map(int, match.groups()))
+        for match in re.finditer(r"mul\((\d{1,3}),(\d{1,3})\)", text, re.MULTILINE)
+        if map_[match.start(0)]
+    )
+
+
+if __name__ == "__main__":
+    text = Path("../input.txt").read_text(encoding="locale")

events/advent_of_code/2024/03/python/test_aoc_2024_03.py

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+from aoc_2024_03 import part1, part2
+
+
+def test_part1() -> None:
+    assert part1("xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))") == 161
+
+
+def test_part2() -> None:
+    assert part2("xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))") == 48