Leetcode 172 Factorial Trailing Zeroes
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Leetcode 172 Factorial Trailing Zeroes
//0的个数跟10有关,10的个数跟5的个数有关,10分解是2和5,看n的阶乘中有多少个数有5做因子(分解产生2的数一定比分解产生5的多)class Solution {public: int trailingZeroes(int n) { if(n / 5 < 5) return n / 5; else return n / 5 + trailingZeroes(n / 5); }};
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