69A | Young Physicist.cpp

#include "bits/stdc++.h"
#include "iostream"
#include "vector"
#include "map"
#include "unordered_map"
#include "utility"
#include "algorithm"
#include "math.h"
#include "iterator"

using namespace std;

#define nline "\n"
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define PI 3.141592653589793238462
#define fastio() ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int, int> p;
typedef vector< pair<int, int> > v_p;

void solve()
{
    int tc;
    cin >> tc;
    
    int xi, yi, zi;
    
    while(tc--)
    {
        int x, y, z;
        cin >> x >> y >> z;
        
        xi += x;
        yi += y;
        zi += z;
    }
    
    if(xi == 0 && yi == 0 && zi == 0)
    {
        cout << "YES" << nline;
    }
    else
    {
        cout << "NO" << nline;
    }
}
int main()
{	
	fastio();
	
	solve();
	
	return 0;
}