求助~~~~~~~50分

#include <bits/stdc++.h>
using namespace std;
int jiecheng[105], ans[105];
int main()
{
    int n;
    cin >> n;
    jiecheng[0] = ans[0] = 1;
    for (int i = 2; i <= n; i++)
    {
        for (int j = 0; j < 100; j++)
        {
            jiecheng[j] = jiecheng[j] * i;
        }
        for (int j = 0; j < 100; j++)
        {
            if (jiecheng[i] >= 10)
            {
                jiecheng[j + 1] += jiecheng[j] / 10;
                jiecheng[j] %= 10;
            }
        }
        for (int j = 0; j < 100; j++)
        {
            ans[j] += jiecheng[j];
            if (ans[j] >= 10)
            {
                ans[j + 1] += ans[j] / 10;
                ans[j] %= 10;
            }
        }
    }
    int idx = 100;
    for (int i = 100; i >= 0; i--)
    {
        idx = i;
        if (ans[i] != 0)
        {
            break;
        }
    }
    for (int i = idx; i >= 0; i--)
    {
        cout << ans[i];
    }
    return 0;
}