70071

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
70071	sh25_zhangzh	[在线测评解答教程] 求和	C++	Accepted	0 MS	252 KB	146	2025-10-17 14:29:14

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