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Commit ea37c90

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Merge pull request #52 from pramodbharti/master
Improved quick_sort implementation
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‎sorting/quick_sort.py

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+13-26Lines changed: 13 additions & 26 deletions
Original file line numberDiff line numberDiff line change
@@ -1,27 +1,14 @@
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#quick sort implementation in Python by Neville Antony
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"""
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Here is the implementation of quicksort algorithm in python by Pramod Bharti
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quick_sort() function takes an unsorted array and prints sorted array
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"""
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def quick_sort(arr):
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if len(arr) <= 1:
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return arr
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pivot = arr[len(arr) // 2]
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left = [x for x in arr if x < pivot]
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middle = [x for x in arr if x == pivot]
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right = [x for x in arr if x > pivot]
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return quick_sort(left) + middle + quick_sort(right)
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def partition(arr, down, up):
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i = ( down - 1 )
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pivot = arr[up]
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for j in range(down, up):
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if arr[j] <= pivot:
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i = i+1
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arr[i],arr[j] = arr[j],arr[i]
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arr[i+1],arr[up] = arr[up],arr[i+1]
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return ( i+1 )
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def quickSort(arr, down, up):
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if down< up:
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pi = partition(arr, down, up)
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quickSort(arr, down, pi-1)
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quickSort(arr, pi+1, up)
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arr = [91, 72, 68, 23, 37, 55]
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n = len(arr)
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quickSort(arr,0,n-1)
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print("The sorted array is :")
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for i in range(n):
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print ("%d" %arr[i]),
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print (quick_sort([5,2,8,3,9,12,43])) # This will print [2,3,5,8,9,12,43]

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