A. Young Physicist1000 / 水题

Posted 2021-10-02 幽殇默

https://codeforces.com/problemset/problem/69/A

#include<bits/stdc++.h>
using namespace std;
int t,ans1,ans2,ans3;
int main(void)
{
	cin>>t;
	while(t--)
	{
		int a,b,c; cin>>a>>b>>c;
		ans1+=a,ans2+=b,ans3+=c;
	}
	if(!ans1&&!ans2&&!ans3) puts("YES");
	else puts("NO");
	return 0;
}