37317

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
37317	☩Deutschland☩	求1+2+3+...	C++	Accepted	0 MS	244 KB	122	2024-01-20 10:09:10

#include<bits/stdc++.h> using namespace std; int main(){ int n,s; cin>>n; s=(1+n)*n/2; cout<<s; return 0; }