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36 lines
838 B
36 lines
838 B
2 years ago
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def compare(left, right)
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case [left, right]
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in [left, nil]
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1
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in [Integer, Integer]
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left <=> right
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in [Array, Array]
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left.zip(right).each do |left, right|
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case compare(left, right)
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when -1 then return -1
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when 0 # no-op
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when 1 then return 1
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end
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end
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(left.size == right.size) ? 0 : -1
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else
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compare(Array(left), Array(right))
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end
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end
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# part one
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# pairs = ARGF.read.split("\n\n")
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# pairs = pairs.map {|pair| pair.lines(chomp: true).map { eval(_1) }}
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# p pairs.map.with_index {|(left,right),i|
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# [compare(left, right), i+1]
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# }.select {|cmp,_| cmp == -1 }.sum(&:last)
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# part two
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pairs = ARGF.read.lines(chomp: true).reject(&:empty?).map { eval(_1) }
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pairs << [[2]] << [[6]]
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pairs = pairs.sort { compare(_1, _2) }
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a = pairs.index([[2]])
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b = pairs.index([[6]])
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p (a+1)*(b+1)
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