51305

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
51305	张思存	[在线测评解答教程] 求和	C++	Accepted	2 MS	196 KB	130	2024-09-20 19:33:12

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