[백준][C++]#2798 블랙잭

#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;

int card[101];
vector<int> idx;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, m;
    int max = 0;
    cin >> n >> m;
    for (int i = 0; i < n; i++)
    {
        cin >> card[i];
        if (i < 3)
            idx.push_back(1);
        else
            idx.push_back(0);
    }
    sort(idx.begin(), idx.end());
    do
    {
        int total = 0;
        for (int i = 0; i < idx.size(); i++)
        {
            if (idx[i] == 1)
            {
                total += card[i];
            }
        }
        if (max < total && total <= m)
            max = total;
    } while (next_permutation(idx.begin(), idx.end()));
    cout << max << "\n";
    return 0;
}