#include <bits/stdc++.h> using namespace std; void baron(int n){ int sum=0; for(int i=1;i<=n;i++){ int m=1; for(int j=1;j<=i;j++){ m*=j; } sum+=m; } cout<<sum; } int main() { int a; cin>>a; baron(a); return 0; }

点个关注！

就把此题的核心部分放到函数里就行了代码见下

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

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