function bubbleSort(t)
    for i, _ in pairs(t) do
        firstindex = i
        break
    end
    temp = nil
    for i = firstindex, (#t-1) do
        for j = firstindex, (#t-1) do
            if (t[j] > t[j+1]) then
                temp = t[j]
                t[j] = t[j+1]
                t[j+1] = temp
            end
        end
    end
end

function visualize(t)
    for i, v in pairs(t) do
        if type(v) == "number" then
            print(i, string.rep("=", v))
        end
    end
end

function randomize(t, st, en)
    for i=st, en do
        t[i] = math.random(st, en)
    end
end

mass1 = {}
print("Before sorting:")
randomize(mass1, 1, 50)
visualize(mass1)
print("After sorting:")
bubbleSort(mass1)
visualize(mass1)