44101

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
44101	奚晨瑞	求1+2+3+...	C++	Accepted	0 MS	244 KB	112	2024-03-29 14:50:34

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