The GNU Compiler Collection (usually shortened to GCC) is a compiler system produced by the GNU Project supporting various programming languages. But it doesn’t contains the math operator “!”.
In mathematics the symbol represents the factorial operation. The expression n! means "the product of the integers from 1 to n". For example, 4! (read four factorial) is 4 × 3 × 2 × 1 = 24. (0! is defined as 1, which is a neutral element in multiplication, not multiplied by anything.)

We want you to help us with this formation: (0! + 1! + 2! + 3! + 4! + ... + n!)%m

1

10 861017

593846

唬人的题目，当x>=m, x! =0 mod m
我们就是在求小于m的 ∑x!
提取公因式化简得
1+（1*2）+（1*2*3）+.....+(1*2*3*....*x)=1*(1+2*(1+3*(.....x-1*(1+x))))

#include<iostream>

#include<cstdio>

#include<cstring>

#include<queue>

#include<algorithm>

using namespace std;

int main()

{

    char n[105];

    int m,t;

    scanf("%d",&t);

    while(t--)

    {

        scanf("%s",n);

        getchar();

        scanf("%d",&m);

        int s=strlen(n);

        int n1=0;

        for(int i=0;i<s;i++)

        {

            n1*=10;

            n1+=n[i]-'0';

            if(n1>=m)

                break;

        }

        long long ans;

        if(n1>=m)

        {

            ans=m-1;

            for(int i=m-2;i>=1;i--)

            {

                ans=(ans+1)%m*i%m;

            }

        }

        else

        {

            ans=n1;

            for(int i=n1-1;i>=1;i--)

            {

                ans=(ans+1)%m*i%m;

            }

        }

        ans++;

        cout<<ans%m<<endl;

    }

}