原题地址: https://oj.leetcode.com/problems/factorial-trailing-zeroes/ 题目内容: Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 方法: 数学原理很简单,稍微讲一下 我们知道,一堆数相乘出了0,除了有0之外,需要一个2,5数对.比如4…