Created
February 17, 2014 10:59
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N!中0的个数
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| > Written with [StackEdit](https://stackedit.io/). | |
| 其实就是求质数分解中，5的指数k | |
| N! = 2^i * 3^j * 5^k * ... | |
| 变体：N！中二进制表示中最低位1的位置 | |
| 其实就是求质数分解中，2的指数+1 |
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