13 lines
332 B
Ruby
13 lines
332 B
Ruby
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# Alphametics class
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class Alphametics
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def self.solve(puzzle)
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chars = puzzle.chars & ('A'..'Z').to_a
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(0..9).to_a.permutation(chars.length).each do |numbers|
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equation = puzzle.tr(chars.join, numbers.join)
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next if equation =~ /\b0/
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return Hash[chars.zip(numbers)] if eval(equation)
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end
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{}
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end
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end
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