func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     vector<int> v(4);     int total = 0;     for (int i = 0; i < 4; i++) {       scanf( %d , &v[i]);       total += v[i];     }     sort(v.begin(), v.end());     do {       int sum = 0;       for (int i = 0; i < 4; i++) {         sum += v[i];         if (2 * sum == total) {           cout <<  YES ;           return 0;         }       }     } while (next_permutation(v.begin(), v.end()));     cout <<  NO ;     return 0;   }   