func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int x = 0, y = 0, z = 0;     for (int i = 0; i < n; i++) {       int a, b, c;       cin >> a >> b >> c;       x += a;       y += b;       c += z;     }     if (!x && !y && !z)       cout <<  YES ;     else       cout <<  NO ;   }   