Example 1: Quick Sort python
def partition(array, begin, end):
pivot_idx = begin
for i in xrange(begin+1, end+1):
if array[i] <= array[begin]:
pivot_idx += 1
array[i], array[pivot_idx] = array[pivot_idx], array[i]
array[pivot_idx], array[begin] = array[begin], array[pivot_idx]
return pivot_idx
def quick_sort_recursion(array, begin, end):
if begin >= end:
return
pivot_idx = partition(array, begin, end)
quick_sort_recursion(array, begin, pivot_idx-1)
quick_sort_recursion(array, pivot_idx+1, end)
def quick_sort(array, begin=0, end=None):
if end is None:
end = len(array) - 1
return quick_sort_recursion(array, begin, end)
Example 2: quicksort code in python
#this function is for getting correct position of pivot
def pivot_place(list1,first,last):
pivot = list1[first]
left = first + 1
right = last
while True :
while left <= right and list1[left] <= pivot :
left += 1
while left<=right and list1[right] >= pivot:
right -= 1
if right < left :
break
else:
list1[left],list1[right] = list1[right],list1[left]
list1[first],list1[right] = list1[right],list1[first]
return right
def quicksort(list1,first,last):
if first < last :
p = pivot_place(list1,first,last)
quicksort(list1,first,p-1)
quicksort(list1,p+1,last)
n = int(input("How many elements you want : "))
list1 = [int(input("Enter elements : ")) for x in range(n)]
quicksort(list1,0,n - 1)
print(list1)
Example 3: quicksort in python
def partition(arr, low, high):
i = (low-1)
pivot = arr[high]
for j in range(low, high):
if arr[j] <= pivot:
i = i+1
arr[i], arr[j] = arr[j], arr[i]
arr[i+1], arr[high] = arr[high], arr[i+1]
return (i+1)
def quickSort(arr, low, high):
if len(arr) == 1:
return arr
if low < high:
pi = partition(arr, low, high)
quickSort(arr, low, pi-1)
quickSort(arr, pi+1, high)
arr = [10, 7, 8, 9, 1, 5]
n = len(arr)
quickSort(arr, 0, n-1)
print("Sorted array is:")
for i in range(n):
print("%d" % arr[i]),
Example 4: quick sort algorithm in python
def quicksort(arr):
if len(arr) <= 1:
return arr
pivot = arr[len(arr) // 2]
left = [x for x in arr if x < pivot]
middle = [x for x in arr if x == pivot]
right = [x for x in arr if x > pivot]
return quicksort(left) + middle + quicksort(right)
print(quicksort([3,6,8,10,1,2,1]))
# Prints "[1, 1, 2, 3, 6, 8, 10]"
Example 5: python with quick sort
[12, 19, 21, 27, 28, 29, 31, 41, 44, 44, 58, 66, 76, 78, 83, 87, 88, 97, 99]
Example 6: python with quick sort
array = [29,99,27,41,66,28,44,78,87,19,31,76,58,88,83,97,12,21,44]
quick_sort(array, 0, len(array) - 1)
print(array)