82579

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
82579	sh25_wanghy	[在线测评解答教程] 求和	C++	Accepted	1 MS	244 KB	149	2026-01-15 19:28:58

#include<bits/stdc++.h> using namespace std; int main() { int n; while(cin>>n){ cout<<n*(n+1)/2<<'\n'; } return 0; }