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58 lines
1.5 KiB
58 lines
1.5 KiB
import sys
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def main():
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lines = [line.rstrip() for line in sys.stdin]
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deck1, deck2 = parse_lines(lines)
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# Part 1
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while deck1 and deck2:
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c1, c2 = deck1.pop(0), deck2.pop(0)
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if c1 > c2:
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deck1 += [c1, c2]
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else:
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deck2 += [c2, c1]
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deck_win = deck1 or deck2
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print("Score:", score(deck_win))
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# Part 2
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deck1, deck2 = parse_lines(lines)
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winner = rec_game(deck1, deck2)
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deck_win = deck1 if winner == 1 else deck2
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print("Score:", score(deck_win))
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def parse_lines(lines):
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deck1, deck2 = [], []
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for line in lines:
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if not line:
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continue
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if line.startswith("P"):
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deck = deck1 if int(line[7:8]) == 1 else deck2
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else:
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deck.append(int(line))
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return deck1, deck2
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def score(deck):
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return sum(c * (i + 1) for i, c in enumerate(reversed(deck)))
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def rec_game(deck1, deck2):
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past_decks = set()
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while deck1 and deck2:
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h = tuple(deck1), tuple(deck2)
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if h in past_decks:
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return 1
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past_decks.add(h)
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c1, c2 = deck1.pop(0), deck2.pop(0)
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if len(deck1) >= c1 and len(deck2) >= c2:
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if rec_game(deck1[:c1], deck2[:c2]) == 1:
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deck1 += [c1, c2]
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else:
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deck2 += [c2, c1]
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elif c1 > c2:
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deck1 += [c1, c2]
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else:
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deck2 += [c2, c1]
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return 1 if deck1 else 2
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if __name__ == "__main__":
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main()
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