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47 lines
1.0 KiB
47 lines
1.0 KiB
require "set"
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decks = ARGF.read.split("\n\n").map {|players| players.split("\n")[1..].map(&:to_i) }
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# part one
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# until decks.any?(&:empty?)
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# p decks
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# top_cards = decks.map(&:shift)
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# fail if top_cards.tally.size == 1
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# if top_cards.first > top_cards.last
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# decks.first.concat(top_cards)
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# else
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# decks.last.concat(top_cards.reverse)
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# end
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# end
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SEEN = Set.new
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def recursive_combat!(decks)
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until decks.any?(&:empty?)
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return 0 if SEEN.include?(decks)
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SEEN << decks
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top_cards = decks.map(&:shift)
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winner = if decks.zip(top_cards).all? {|d,tc| d.size >= tc }
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recursive_combat!(decks.zip(top_cards).map {|d,tc| d[0,tc] })
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elsif top_cards.first > top_cards.last
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0
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else
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1
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end
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if winner == 0
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decks.first.concat(top_cards)
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else
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decks.last.concat(top_cards.reverse)
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end
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end
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decks.index {|d| !d.empty? }
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end
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recursive_combat!(decks)
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p decks.flatten.reverse.map.with_index {|v,i| v * (i+1) }.sum
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