func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int c1 = 0, c2 = 0, c3 = 0;     for (int i = 0; i < n; i++) {       int x, y, z;       cin >> x >> y >> z;       c1 += x, c2 += y, c3 += z;     }     if (c1 == 0 && c2 == 0 && c3 == 0)       cout <<  YES ;     else       cout <<  NO ;     return 0;   }   