AoC 2024 01

Signed-off-by: GitHub <[email protected]>

events/advent_of_code/2024/01/python/aoc_2024_01.py

@@ -0,0 +1,31 @@
+from collections import Counter
+from pathlib import Path
+
+
+def parse_input(text: str) -> tuple[list[int], list[int]]:
+    rows = text.strip().split("\n")
+
+    left = []
+    right = []
+    for row in rows:
+        left_str, right_str = row.split()
+        left.append(int(left_str))
+        right.append(int(right_str))
+    left.sort()
+    right.sort()
+    return left, right
+
+
+def part1(left: list[int], right: list[int]) -> int:
+    return sum(abs(left[index] - right[index]) for index in range(len(left)))
+
+
+def part2(left: list[int], right: list[int]) -> int:
+    right_counter = Counter(right)
+    return sum(left_number * right_counter[left_number] for left_number in left)
+
+
+if __name__ == "__main__":
+    rows = Path("../input.txt").read_text(encoding="locale")
+    print(part1(*parse_input(rows)))
+    print(part2(*parse_input(rows)))

events/advent_of_code/2024/01/python/test_aoc_2024_01.py

@@ -0,0 +1,20 @@
+import pytest
+from aoc_2024_01 import parse_input, part1, part2
+
+TEST_INPUT = """
+3   4
+4   3
+2   5
+1   3
+3   9
+3   3
+"""
+
+def test_parse_input() -> None:
+    assert parse_input(TEST_INPUT) == ([1, 2, 3, 3, 3, 4], [3, 3, 3, 4, 5, 9])
+
+def test_part1() -> None:
+    assert part1(*parse_input(TEST_INPUT)) == 11
+
+def test_part2() -> None:
+    assert part2(*parse_input(TEST_INPUT)) == 31