Balança Equilibrada

#include <bits/stdc++.h>
using namespace std;

#define eps 1e-9
#define eq(a, b) (abs(a-b) < eps)

double v[4], acc, sum;

int main() {
    for (int i : {0, 1, 2, 3}) {
        cin >> v[i];
        acc += v[i];
    }

    do {
        sum = 0;
        for (int i : {0, 1, 2, 3}) {
            sum += v[i];
            if (eq(acc - sum, sum)) {
                cout << "YES\n";
                return 0;
            }
        }

    } while (next_permutation(v, v+4)) ;

    cout << "NO\n";

    return 0;
}