求助！！！只拿到50分

liu_le_chen @ 2023-08-03 21:41:40

#include<bits/stdc++.h>
using namespace std;
long long n,cnt=1,s; 
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=i;j++){
            cnt*=j;
        }
        s+=cnt;
        cnt=1;
    }
    cout<<s;
    return 0;
}

by ybc2025chenyuyang @ 2023-08-03 21:44:03

嗯,这题要用高精,或者是用Py

by _Fancy_ @ 2023-08-03 21:44:39

@liulechen 或者开int128

by liu_le_chen @ 2023-08-03 21:48:32

大佬帮忙改一下好吗？

by ybc2025chenyuyang @ 2023-08-03 21:54:02

int128只有50分,所以还是要用高精度或派森

by ybc2025chenyuyang @ 2023-08-03 21:54:53

建议lz先学一下高精度再来做此题

by ybc2025chenyuyang @ 2023-08-03 21:57:24

不对,int128有75分

by liu_le_chen @ 2023-08-03 21:57:44

其实已经学完了高精度了，不过这题不知道怎么用

by kunkun123456 @ 2023-08-06 16:22:03

#include<bits/stdc++.h>
using namespace std;
int n;
vector<int> jia(vector<int>a, vector<int>b )
{
    vector<int> ans;
    if(a.size()<b.size()) swap(a,b);
    int t=0;
    for(int i=0;i<a.size();i++)
    {
        t+=a[i];
        if(i<b.size()) t+=b[i];
        ans.push_back(t%10);
        if(t>=10) t=1;
        else t=0;
    }
    if(t) ans.push_back(t);
    return ans;
}
vector<int> mul(vector<int> a,int b)
{
    vector<int> res;
    for (int i = 0; i < a.size(); i++)
        a[i] *= b;
    int t = 0;
    for (int i = 0; i < a.size(); i++) 
    {
        t += a[i];
        res.push_back(t%10);
        t /= 10;
    }
    while (t) res.push_back(t%10), t /= 10; 
    while (res.size() > 1 && res.back() == 0) res.pop_back();
    return res;
}
vector<int> func(int a)
{
    vector<int> ans;
    ans.push_back(1);
    for(int i=1;i<=a;i++)
    {
        ans=mul(ans,i);
    }
    return ans;
}
int main()  
{
    cin>>n;
    vector<int> ans;
    ans.push_back(0);
    for(int i=1;i<=n;i++)
    {
        ans=jia(ans,func(i));
    }
    for(int i=ans.size()-1;i>=0;i--)
    {
        cout<<ans[i];
    }
}

by kunkun123456 @ 2023-08-06 16:24:40

可以直接抄 快感谢我

by kunkun123456 @ 2023-08-06 16:33:49

对了，我大号叫shabi12345，被黑客改成这个名字，黑客在我电脑上发言被禁了，如果管理员能看见，能把禁言解除吗