Write a Python program to sort a list of elements using the quick sort algorithm.
Note : According to Wikipedia “Quicksort is a comparison sort, meaning that it can sort items of any type for which a “less-than” relation (formally, a total order) is defined. In efficient implementations it is not a stable sort, meaning that the relative order of equal sort items is not preserved. Quicksort can operate in-place on an array, requiring small additional amounts of memory to perform the sorting.”
def quickSort(data_list): quickSortHlp(data_list,0,len(data_list)-1) def quickSortHlp(data_list,first,last): if first < last: splitpoint = partition(data_list,first,last) quickSortHlp(data_list,first,splitpoint-1) quickSortHlp(data_list,splitpoint+1,last) def partition(data_list,first,last): pivotvalue = data_list[first] leftmark = first+1 rightmark = last done = False while not done: while leftmark <= rightmark and data_list[leftmark] <= pivotvalue: leftmark = leftmark + 1 while data_list[rightmark] >= pivotvalue and rightmark >= leftmark: rightmark = rightmark -1 if rightmark < leftmark: done = True else: temp = data_list[leftmark] data_list[leftmark] = data_list[rightmark] data_list[rightmark] = temp temp = data_list[first] data_list[first] = data_list[rightmark] data_list[rightmark] = temp return rightmark data_list = [54,26,93,17,77,31,44,55,20] quickSort(data_list) print(data_list)
[17, 20, 26, 31, 44, 54, 55, 77, 93]
Write a Python program to sort a list of elements using the quick sort algorithm
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