func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, x, y, z, xsum(0), ysum(0), zsum(0);     cin >> n;     while (n--) {       cin >> x >> y >> z;       xsum += x;       ysum += y;       zsum += z;     }     if (xsum == 0 && ysum == 0 && zsum == 0) {       cout <<  YES  << endl;     } else {       cout <<  NO  << endl;     }     return 0;   }   