54360

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
54360	zhangweiran	[在线测评解答教程] 求和	C++	Accepted	0 MS	188 KB	130	2024-10-27 15:39:12

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