function quicksort(array, left, right)
if right <= left
return
end
pivot = array[(left + right) ÷ 2]
i = left
j = right
while i <= j
while array[i] < pivot
i += 1
end
while array[j] > pivot
j -= 1
end
if i > j
break
end
array[i], array[j] = array[j], array[i]
i += 1
j -= 1
end
quicksort(array, left, j)
quicksort(array, i, right)
end
array = [7, 3, 0, 1, 5, 2, 5, 19, 10, 5]
quicksort(array, 1, length(array))
println(array)