求阶乘末尾零个数的方法,刚学会的
具体参见http://blog.sina.com.cn/s/blog_4fd55a4f01007ugc.html
http://blog.sina.com.cn/s/blog_5f36f8370100eb0h.html
#include<iostream> #include<cstring> #include<cstdio> #define ll long long using namespace std; ll a; ll f(ll t){ if(t<5) return 0; return t/5+f(t/5); } int main(){ int t; scanf("%d",&t); while(t--){ scanf("%ld",&a); printf("%ld\n",f(a)); } return 0; } /************************************** Problem id : SDUT OJ 2500 Result : Accepted Take Memory : 456K Take Time : 0MS Submit Time : 2013-06-02 00:43:23 **************************************/