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25 lines
540 B
25 lines
540 B
11 months ago
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lines = ARGF.readlines(chomp: true)
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# part one
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p lines
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.map { _1.chars.select {|c| c =~ /\d/ }}
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.map { _1.values_at(0, -1) }
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.sum { _1.join.to_i }
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# part two
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spellings = %w[
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one two three four five six seven eight nine
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].each.with_index.to_h { [_1, _2 + 1] }
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digits = (spellings.keys + spellings.values).join(?|)
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first_re = /(#{digits})(?~#{digits})/
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last_re = /.*(#{digits})/
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p lines
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.sum { |line|
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[first_re, last_re]
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.map { _1.match(line)[1] }
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.map { spellings.fetch(_1, &:to_i) }
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.join
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.to_i
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}
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