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January 2, 2016 23:59
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Combinationの総数を計算する
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| def combination(n, m): | |
| a, b = 1, 1 | |
| if m > n / 2: | |
| m = n - m | |
| for i in xrange(m): | |
| a *= n - i | |
| b *= i + 1 | |
| return a / b |
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