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这样做组合为何不对？思路： n位数，需要邻乘为k； 那么n位bit 两两分组共n-1组，这n-1组中只要有k组乘积为1既满足。 及在n-1组中取k组 示例1 5 2 为 4组中取2组， 组合数为6. 这里面有重复计数吗？ Followed by: Post your reply here: |
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