51303

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
51303	张思存	[在线测评解答教程] 求和	C++	Compile Error	0 MS	0 KB	178	2024-09-20 19:30:51

#include<bits/stdc++.h> using namespace std; int main() { int n; cin >> n; while(scanf("%d",&n)!=EOF){ printf("%d\n",(n+1)*n/2) } return 0; }