Função Matchmaking em Lua

function matchMaking(players)
    local a, b, c = {}, {}, table.copy(players)
    while (sum(a) >= sum [b] and  #b < #players / 2)
        table.insert(b, c[#c])
        c.remove(c, #c)
        if sum(b) > sum(a) then
            a, b = b, a
        end
    a  = a + copy[1]
    return a, b
end