func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(0), cin.tie(0);     int arr[4];     for (int i = 0; i < (int)4; i++) cin >> arr[i];     sort(arr, arr + 4);     bool ok = 0;     for (int mask = 0; mask < (1 << 4); mask++) {       int sum1 = 0;       int sum2 = 0;       for (int bit = 0; bit < 4; bit++) {         if (mask & (1 << bit)) {           sum1 += arr[bit];         } else {           sum2 += arr[bit];         }       }       if (sum1 == sum2) {         ok = 1;         break;       }     }     if (ok)       cout <<  YES  <<   n ;     else       cout <<  NO  <<   n ;     return 0;   }   