42045

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
42045	奚晨瑞	求1+2+3+...	C++	Accepted	1 MS	240 KB	146	2024-02-24 09:30:00

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