memset(memo, 0, sizeof memo);
memo[0][0][0] = 1;

for (int p = 0; p < TOTAL_PEOPLE; ++p)
{
    for (int w = 0; w <= MAX_WEIGHT; ++w)
    {
        for (int u = 0; u < MAX_USED; ++u)
        {
            if (memo[w][p][u] == 1)
            {
                memo[w][p+1][u] = 1;
                memo[w+person[p]][p+1][u+1] = 1;
            }
        }
    }
}