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day22part2.py
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day22part2.py
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def deck2string(deck):
return "".join("{:02d}".format(v) for v in deck)
def play_game(p1deck, p2deck, return_deck=False):
p1deck, p2deck = list(p1deck), list(p2deck)
prev_rounds = []
while True:
this_config = (deck2string(p1deck), deck2string(p2deck))
if this_config in prev_rounds:
if return_deck:
return "p1", p1deck
else:
return "p1"
prev_rounds.append(this_config)
p1card, p2card = p1deck.pop(0), p2deck.pop(0)
if len(p1deck) >= p1card and len(p2deck) >= p2card:
round_winner = play_game(p1deck[:p1card], p2deck[:p2card])
else:
round_winner = "p1" if p1card > p2card else "p2"
winnerdeck = p1deck if round_winner == "p1" else p2deck
winnerdeck += [
p1card if round_winner == "p1" else p2card,
p2card if round_winner == "p1" else p1card
]
if p1deck and p2deck:
continue
return_value = "p1" if not p2deck else "p2"
if return_deck:
return_value = (return_value, p1deck if return_value == "p1" else p2deck)
return return_value
INPUT_FILE = "input"
player1, player2 = open(INPUT_FILE).read().split("\n\n")
p1deck = list(map(int, player1.split("\n")[1:]))
p2deck = list(map(int, player2.split("\n")[1:]))
_, winning_deck = play_game(p1deck, p2deck, True)
winning_deck.reverse()
final_score = sum(i * v for i, v in enumerate(winning_deck, 1))
print(final_score)