func_code_string: #include <bits/stdc++.h>   using namespace std;   signed main() {     long long a[4];     for (long long i = 0; i < 4; i++) cin >> a[i];     sort(a, a + 4);     if ((a[3] + a[0] == a[2] + a[1]) || (a[3] == a[0] + a[1] + a[2]))       cout <<  YES  << endl;     else       cout <<  NO  << endl;     return 0;   }   