void lock_pairs(void)
{
    int edge[candidate_count];
    for (int i = 0; i < candidate_count; i++)
    {
        edge[i] = 0;
    }
    for (int i = 0; i < pair_count; i++)
    {
        int m = 0;
        edge[pairs[i].loser] = 1;
        for (int j = 0; j < candidate_count; j++)
        {
            m += edge[j];
        }

        if (m == candidate_count)
        {
            edge[pairs[i].loser] = 0;
        }
        else
        {
            locked[pairs[i].winner][pairs[i].loser] = true;
        }
    }
    return;
}