【每天一道编程系列-2018.3.14】—— Trailing Zeros

【题目描述】

 O(log N) time

Write an algorithm which computes the number of trailing zeros in n factorial.

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Yes

Example

11! = 39916800, so the out should be 2

【题目大意】

设计一个算法，计算出n阶乘中尾部零的个数

【本题答案】