aoc/14_recipes.py

#!/usr/bin/env python3
n = 440231
digits = []
s = n
while s:
    digits.append(s % 10)
    s //= 10
nb = bytes(reversed(digits))
scores = bytearray((3, 7))
a, b = 0, 1

while len(scores) <= 11 + n or nb not in scores[-8:]:
    sa = scores[a]
    sb = scores[b]
    s = sa + sb
    if s > 9:
        scores.append(s // 10)
    scores.append(s % 10)
    a = (a + 1 + sa) % len(scores)
    b = (b + 1 + sb) % len(scores)

print(''.join(chr(x + ord('0')) for x in scores[n:n + 10]))
print(scores.rindex(nb))