75649

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
75649	sh25_zhuwy	求和	C++	Accepted	0 MS	248 KB	186	2025-12-08 20:42:11

#include<bits/stdc++.h> using namespace std; int main() { int n,sum=0; cin>>n; for(int i=1;i<=n;i++) { sum+=(i+1)*i/2; } cout<<sum; return 0; }