67387

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
67387	jdf25_chenght	[在线测评解答教程] 求和	C++	Accepted	1 MS	248 KB	162	2025-09-17 17:45:34

#include <iostream> using namespace std; int main() { int n; while (cin >> n) { cout << n * (n + 1) / 2 << endl; } return 0; }