17 lines
328 B
Ruby
17 lines
328 B
Ruby
#!/usr/bin/env ruby
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class Array
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def combinations n
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result = Array.new
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if n > 0
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(0 .. self.length - n).each do |i|
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combs = self[i + 1 .. -1].combinations(n - 1)
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combs = [[]] if combs.empty?
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combs.collect {|comb| [self[i]] + comb}.each {|x| result << x}
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end
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end
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return result
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end
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end
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