parent
7f25d2bde6
commit
b5bfbcff0b
@ -1,26 +1,17 @@
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histories = ARGF.readlines.map { _1.scan(/-?\d+/).map(&:to_i) }
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# part one
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p histories
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.map {|history|
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history_diffs = histories.map {|history|
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diffs = [history]
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until diffs.last.all?(&:zero?)
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diffs << diffs.last.each_cons(2).map { _2 - _1 }
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end
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diffs
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}
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diffs.sum(&:last)
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}
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.sum
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# part one
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p history_diffs.sum { _1.sum(&:last) }
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# part two
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p histories
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.map {|history|
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diffs = [history]
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until diffs.last.all?(&:zero?)
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diffs << diffs.last.each_cons(2).map { _2 - _1 }
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end
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p history_diffs.sum {|diffs|
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diffs.map(&:first).reverse.inject { _2 - _1 }
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}
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.sum
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}
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