quick_sort = lambda array: array if len(array) <= 1 else quick_sort([item for item in array[1:] if item <= array[0]]) + [array[0]] + quick_sort([item for item in array[1:] if item > array[0]])

def quick_sort(array, left, right):
  if left >= right:
    return
  low = left
  high = right
  key = array[low]
  while left < right:
    while left < right and array[right] > key:
      right -= 1
    array[left] = array[right]
    while left < right and array[left] <= key:
      left += 1
    array[right] = array[left]
  array[right] = key
  quick_sort(array, low, left - 1)
  quick_sort(array, left + 1, high)

def quick_sort(array, l, r):
  if l < r:
    q = partition(array, l, r)
    quick_sort(array, l, q - 1)
    quick_sort(array, q + 1, r)
 
def partition(array, l, r):
  x = array[r]
  i = l - 1
  for j in range(l, r):
    if array[j] <= x:
      i += 1
      array[i], array[j] = array[j], array[i]
  array[i + 1], array[r] = array[r], array[i+1]
  return i + 1

def quick_sort(array, l, r):
  if l >= r:
    return
  stack = []
  stack.append(l)
  stack.append(r)
  while stack:
    low = stack.pop(0)
    high = stack.pop(0)
    if high - low <= 0:
      continue
    x = array[high]
    i = low - 1
    for j in range(low, high):
      if array[j] <= x:
        i += 1
        array[i], array[j] = array[j], array[i]
    array[i + 1], array[high] = array[high], array[i + 1]
    stack.extend([low, i, i + 2, high])