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17 lines
373 B
17 lines
373 B
4 years ago
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adapters = ARGF.read.scan(/\d+/).map(&:to_i)
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outlet = 0
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device = adapters.max + 3
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dist = (adapters + [outlet, device]).sort.each_cons(2).map {|a,b| b - a }
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# part 1
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# tally = dist.tally
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# p dist[1] * dist[3]
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p dist
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.slice_when {|a,b| a != b }
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.select {|run| run.first == 1 }
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.map {|run| { 1 => 1, 2 => 2, 3 => 4, 4 => 7 }.fetch(run.size) }
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.inject {|a,b| a*b }
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