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masarakki/self_product_with_length.rb

Created September 4, 2012 11:57
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ある集合の長さnの直積集合を求める
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self_product_with_length.rb
class Array
def **(num)
args = []
(num - 1).times { args << self }
product(*args)
end
end
[0,1] ** 3 #=> [[0, 0, 0], [0, 0, 1], [0, 1, 0], [0, 1, 1], [1, 0, 0], [1, 0, 1], [1, 1, 0], [1, 1, 1]]
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