56274

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
56274	zhangweiran	求和	C++	Accepted	1 MS	252 KB	169	2024-11-09 22:48:41

#include<iostream> using namespace std; int main() { int n; int N; cin>>n; if(n%2==1){ N=n; } else{ N=n+1; } cout<<(N+1)*(N+1)/4; return 0; }