func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename T>   void prn(T first) {     cout << first <<   n ;   }   int main() {     int a[4];     cin >> a[0] >> a[1] >> a[2] >> a[3];     sort(a, a + 4);     if (a[0] + a[3] == a[1] + a[2] || a[3] == a[0] + a[1] + a[2]) {       cout <<  YES ;     } else {       cout <<  NO ;     }     return 0;   }   