zju 2022 Factorial

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=1022

// 记录因子5的个数
#include < iostream >
using   namespace  std;
int  main()
{
    int t;
    cin>>t;
    while(t--)
    {
        __int64 n,sum=0,p=5;
        scanf("%I64d",&n);
        while(p<=n)
        {
            sum += n/p;
            n /= 5;
        }
        printf("%I64d\n",sum);
    }
    return 0;
}