func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     int a, b, c;     cin >> n;     int tong = 0, tong1 = 0, tong2 = 0;     for (int i = 0; i < n; i++) {       cin >> a >> b >> c;       tong += a;       tong1 += b;       tong2 += c;     }     if (tong == 0 && tong1 == 0 && tong2 == 0)       cout <<  YES ;     else       cout <<  NO ;     return 0;   }   