poj 1423 Big Number

#include <iostream>#include <cstdlib>#include <cstdio>#include <cstring>#include <cmath>using namespace std;#define eps 1e-8int main(){    int t;    scanf("%d", &t);    while (t--)    {        int n;        scanf("%d", &n);        double ans = log10(sqrt(2 * acos(-1) * n)) + n * log10(n / exp(1.0));        printf("%dn", (int)ans + 1);    }    return 0;}