338556

Run ID	Author	Problem	Lang	Verdict	Score	Time	Memory	Code Length	Submit Time
338556	陈信宇	[在线测评解答教程] 求和	C++	Accepted	100	4 MS	192 KB	126	2025-08-07 16:52:36

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