func_code_string: #include <bits/stdc++.h>   using namespace std;   bool chk(int a, int b, int c, int sum) { return a + b + c == sum; }   int main() {     int sum = 0;     vector<int> u(6);     for (int i = 0; i < 6; i++) {       cin >> u[i];       sum += u[i];     }     if (sum % 2) {       cout <<  NO ;       return 0;     }     sum /= 2;     for (int a = 0; a < 6; a++)       for (int b = 0; b < 6; b++)         for (int c = 0; c < 6; c++)           if (a != b && b != c && a != c && u[a] + u[b] + u[c] == sum) {             cout <<  YES ;             return 0;           }     cout <<  NO ;     return 0;   }   