c++50分，求助

tu_huang_di @ 2023-03-31 21:24:04

#include<iostream>
using namespace std;
int main()
{
    long long s,n,i,j,t;
    cin>>n;
    for(i=1;i<=n;i++)
    { 
        t=1;
        for(j=1;j<=i;j++)
        t*=j;
        s+=t;
    }
    cout<<s;
}

by Ice_lift @ 2023-03-31 21:26:35

@sunyuchen1 注：高精度

by tu_huang_di @ 2023-03-31 21:34:16

什么意思

by moli0518_qwq @ 2023-03-31 21:48:11

@sunyuchen1 高精度你开longlong都AC不了，50分很好了

by xxc123 @ 2023-04-10 22:16:27

求关注

 #include<iostream>
using namespace std;
int a[1001],b[1001];
void add()
{
    int t=0;
    for(int i=1000;i>=1;i--)
    {
        b[i]=b[i]+a[i]+t;
        t=b[i]/10;
        b[i]%=10;
    }
}
void multiplication(int x)
{
    int t=0;
    for(int i=1000;i>=1;i--)
    {
        a[i]=a[i]*x+t;
        t=a[i]/10;
        a[i]%=10;
    }
}
void print()
{
    int flag=0;
    for(int i=1;i<=1000;i++)
    {
        if(b[i]!=0) flag=1;
        if(flag) cout<<b[i];
    }
}
int main()
{
    a[1000]=b[1000]=1;
    int n;
    cin>>n;
    for(int i=2;i<=n;i++)
    {
        multiplication(i);
        add();
    }
    print();
    return 0;
}

从末尾算，a是阶乘积，s是和

by xxc123 @ 2023-04-10 22:16:36

@sunyuchen1

by tu_huang_di @ 2023-04-14 19:32:59

@xxc123 已过谢谢