28502

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
28502	惠子铭	[在线测评解答教程] 求和	C++	Accepted	0 MS	244 KB	136	2023-10-14 21:39:32

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