27742

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
27742	惠子铭	[在线测评解答教程] 求和	C++	Wrong Answer	0 MS	248 KB	106	2023-10-07 19:22:43

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