#include<iostream>
#include<cmath>
using namespace std;
double e = 2.7182818284590452354, pi = 3.141592653589793239;

int main()
{
	int testnumber;
	cin >> testnumber;
	int i;
	for (i = 0; i < testnumber; i++)
	{
		int n;
		cin >> n;
		double m = log10(2 * pi*n) / 2.0 + n*(log10(n / e)) + 1;
		int answer = (int)m;
		cout << answer << endl;
	}
	return 0;
}
上面是错的，下面是对的
#include<iostream>
#include<cmath>
using namespace std;
double e = 2.7182818284590452354, pi = 3.141592653589793239;

int main()
{
	int testnumber;
	cin >> testnumber;
	int i;
	for (i = 0; i < testnumber; i++)
	{
		int n;
		cin >> n;
		double m = log10(2 * pi*n) / 2.0 + n*(log10(n / e)) ;
		int answer = (int)m;
                answer++;
		cout << answer << endl;
	}
	return 0;
}

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