70599

Run ID	Author	Problem	Lang	Verdict	Time	Memory	Code Length	Submit Time
70599	sh25_ganzy	分苹果	C++	Accepted	0 MS	252 KB	123	2025-10-18 18:28:56

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