团体程序设计天梯赛-练习集 L1-013 计算阶乘和 (10分)

#include <iostream>
using namespace std;
int main()
{
    int n, ans = 0;
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        int temp = 1;
        for (int j = 1; j <= i; j++)
            temp *= j;
        ans += temp;
    }
    cout << ans;
    return 0;
}