1 #include<cstdio>
 2 #include<cstring>
 3 #include<cmath>
 4 using namespace std;
 5 int main()
 6 {
 7     int n;
 8     scanf("%d",&n);
 9     int t;
10     while(n--)
11     {
12         scanf("%d",&t);
13         double ans = 0;
14         for(int i = 1; i <= t; i++){
15             ans+=log10(i);
16         }
17         ans++;
18         printf("%d\n",(int)ans);
19     }
20     return 0;
21 }

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <math.h>
 4 #define e 2.71828182
 5 #define PI acos(-1)
 6 int main()
 7 {
 8     int t;
 9     int n;
10     double w;             //斯特林数
11     scanf("%d",&t);
12     while(t--)
13     {
14         scanf("%d",&n);
15         w=(1.0/2*log10(2*PI*n)+n*log10(n/e));
16         printf("%d\n",(int) w+1);              //记得+1，不能少。
17     }
18     return 0;
19 }