aoc2023/d04/part2.py

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import sys
L = [[l,1] for l in sys.stdin.read().splitlines()]
for i in range(len(L)):
l, k = L[i]
_, halves = l.split(':')
c1, c2 = halves.split('|')
s1 = set(map(int,c1.strip().split(' ')))
s2 = set(map(int,c2.strip().split(' ')))
n = len(s1&s2)
for j in range(n):
if i+j+1<len(L):
L[i+j+1][1] += k
print(sum(k for l,k in L))