func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 1010;   int a[maxn];   int main() {     int n = 4;     for (int i = 0; i < n; i++) {       cin >> a[i];     }     sort(a, a + n);     int sum, ans;     sum = ans = 0;     ans = a[3];     int l = 0;     n = 2;     while (n >= 0) {       if (ans > sum)         sum += a[n--];       else {         ans += a[n--];       }     }     if (ans == sum)       cout <<  YES  << endl;     else       cout <<  NO  << endl;     return 0;   }   