func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int k;     vector<int> A;     for (int i = 0; i < 4; ++i) {       cin >> k;       A.push_back(k);     }     sort(A.begin(), A.end());     if (A[0] + A[1] + A[2] == A[3] or A[0] + A[3] == A[1] + A[2]) {       cout <<  YES ;     } else {       cout <<  NO ;     }     return 0;   }   