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;

}