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38 lines
813 B
Ruby
38 lines
813 B
Ruby
NUM = /\d+/
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SYM = /[^.]/
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def part1(input)
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part_numbers = []
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input.each_with_index do |line, i|
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offset = 0
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while m = NUM.match(line, offset)
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start = m.begin(0)
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finish = m.end(0)
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offset = finish
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span = [0, start - 1].max..finish
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#p i.to_s, m[0]
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above = input[i - 1][span] if i > 0
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below = input[i + 1][span] if i < input.length - 1
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left = line[start - 1] if start > 0
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right = line[finish]
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#p [line[span], above, below, left, right]
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#p [i, m[0], start, finish, line[span]]
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if [above, below, left, right].compact.any? { |x| x.match?(SYM) }
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part_numbers << m[0].to_i
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end
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end
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end
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part_numbers.sum
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end
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def part2(input)
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# todo
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end
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input = ARGF.readlines.map(&:rstrip)
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puts part1(input)
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puts part2(input)
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