func_code_string: #include <bits/stdc++.h>   int main() {     int n, x, y, z, sum1 = 0, sum2 = 0, sum3 = 0;     scanf( %d , &n);     while (n--) {       scanf( %d %d %d , &x, &y, &z);       sum1 = sum1 + x;       sum2 = sum2 + y;       sum3 = sum3 + z;     }     if (sum1 == 0 && sum2 == 0 && sum3 == 0)       printf( YES );     else       printf( NO );     return 0;   }   