func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int sum1 = 0, sum2 = 0, sum3 = 0;     int n;     cin >> n;     int a, b, c;     for (int i = 0; i < n; i++) {       cin >> a >> b >> c;       sum1 += a;       sum2 += b;       sum3 += c;     }     if (sum1 == 0 && sum2 == 0 && sum3 == 0)       cout <<  YES ;     else       cout <<  NO ;   }   