Cities thing

function clone(table)
    local ntable = {}
    for k,v in pairs(table) do
        ntable[k] = v
    end
    return ntable
end

function getSize(table)
    local size = 0
    for k,v in pairs(table) do
        if v ~= nil then size = size + 1 end
    end
    return size
end

function arrangeInDistance(point)
    local dps = {}
    local cpoints = clone(points)
    while getSize(cpoints) > 0 do
        local index = 1
        local minDist = nil
        for i,p in pairs(cpoints) do
            if p ~= point and p ~= nil then
                local distX = p.x-point.x
                if distX < 0 then distX = distX*-1 end
                local distY = p.y-point.y
                if distY < 0 then distY = distY*-1 end
                local dist = distX+distY
                if minDist == nil then
                    minDist = dist
                    index = i
                elseif dist < minDist then
                    minDist = dist
                    index = i
                end
            end
        end
        dps[#dps + 1] = cpoints[index]
        cpoints[index] = nil
    end
    return dps
end