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32 lines
615 B
32 lines
615 B
4 years ago
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# turns = ARGF.read.scan(/\d+/).map(&:to_i)
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# until turns.size == 2020
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# turns << if turns.count(turns.last) == 1
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# 0
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# else
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# a, b = turns.filter_map.with_index {|x,i|
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# x == turns.last ? i : nil
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# }[-2,2]
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# b - a
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# end
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# end
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start = ARGF.read.scan(/\d+/).map(&:to_i)
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turns = Hash.new
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last = start.pop
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start.each.with_index do |x,i|
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turns[x] = i+1
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end
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(start.size+1...30000000).each do |turn|
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if n = turns[last]
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turns[last] = turn
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last = turn - n
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else
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turns[last] = turn
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last = 0
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end
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end
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p last
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