33071

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
33071	Andrew宥杨	[在线测评解答教程] 求和	C++	Accepted	1 MS	248 KB	129	2023-12-05 21:08:34

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