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Create quicksort #116

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55 changes: 55 additions & 0 deletions Programs/quicksort
Original file line number Diff line number Diff line change
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# Python3 implementation of QuickSort


# Function to find the partition position
def partition(array, low, high):

# Choose the rightmost element as pivot
pivot = array[high]

# Pointer for greater element
i = low - 1

# Traverse through all elements
# compare each element with pivot
for j in range(low, high):
if array[j] <= pivot:
# If element smaller than pivot is found
# swap it with the greater element pointed by i
i = i + 1

# Swapping element at i with element at j
(array[i], array[j]) = (array[j], array[i])

# Swap the pivot element with
# e greater element specified by i
(array[i + 1], array[high]) = (array[high], array[i + 1])

# Return the position from where partition is done
return i + 1

# Function to perform quicksort


def quick_sort(array, low, high):
if low < high:

# Find pivot element such that
# element smaller than pivot are on the left
# element greater than pivot are on the right
pi = partition(array, low, high)

# Recursive call on the left of pivot
quick_sort(array, low, pi - 1)

# Recursive call on the right of pivot
quick_sort(array, pi + 1, high)


# Driver code
array = [10, 7, 8, 9, 1, 5]
quick_sort(array, 0, len(array) - 1)

print(f'Sorted array: {array}')

# This code is contributed by Adnan Aliakbar