Codeforces 69A Young Physicist

A. Young Physicist

Solution in c++

#include<bits/stdc++.h>

#include<string.h>

#include<stdio.h>

#include<math.h>

using namespace std;

int main()

{

    int n,i,a,m,x,y,z,b,c;

cin >> n;

a=0,b=0,c=0;

for(i=0;i<n;i++){

cin >>x >> y >> z;

a+=x;

b+=y;

c+=z;

}

if(a==0 && b==0 && c==0){

cout<<"YES"<<endl;

}

else {

cout<<"NO"<<endl;

} 

}