3515

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
3515	OscarWLY	求和	C++	Accepted	0 MS	244 KB	157	2023-01-08 20:54:11

#include<iostream> using namespace std; int main() { int n; cin>>n; long long ans=0; for(int i=1;i<=n;i++) ans+=i; cout<<ans; return 0; }