aoc2024day1.py

# === Parsing ===
left = []
right = []
with open("input.txt") as f:
    for line in f:
        l, r = map(int, line.split())
        left.append(l)
        right.append(r)


# === Part 1 ===
print(
    sum(
        abs(l - r)
        for l, r in zip(sorted(left), sorted(right))
    )
)

# === Part 2 ===
from collections import Counter

counts = Counter(right)
similarity = 0
for number in left:
    similarity += number * counts[number]
print(similarity)