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