HDU 1018

#include<stdio.h>
#include<math.h>
#define PI 3.14159265
int num,ans;
void count_factorial()
{
    double t;
    t = (num*log(num) - num + 0.5*log(2*num*PI))/log(10);
    ans= (int)t+1;
    printf("%d\n",ans);
}
int main()
{
    int i,n;
    scanf("%d",&n);
    for( i=1 ; i<=n ; i++ )  
    {
        scanf("%d",&num);
        count_factorial();
    }
    return 0;
}





//c++编译错误，g++就ac 
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
    int i,j,k,T;
    cin>>T;
    while(T--)
    {
        int num;
        cin>>num;
        double sum = 0.0;
        for(i=1;i<=num;i++)
            sum += log10(i);
        int ans =(int)sum+1;
        cout<<ans<<endl;
    }
    return 0;
}