【风林火山-深圳】

vector<int> getLeft(int a[], int size)
{
    int b[14] = {0};
    for (int i = 0; i < size; ++i)
    {
        b[a[i]]++;
    }
    for (int i = 1; i < 7; ++i)
    {
        if (b[i] > b[14 - i])
        {
            b[i] -= b[14 - i];
            b[14 - i] = 0;
        }
        else
        {
            b[14 - i] -= b[i];
            b[i]  = 0;
        }
    }
    b[7] &= 0x01;

    std::vector<int> vec;
    for (int i = 1; i < 14; ++i)
    {
        for (int j = 0; j < b[i]; ++j)
        {
            vec.push_back(i);
        }
    }
    return vec;
}