May 2017
Intermediate to advanced
310 pages
8h 5m
English
Content preview from Python Data Structures and Algorithms
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Partition step
The partition step is exactly like we had in the quick sort algorithm. There are a couple of things worthy of note:
def partition(unsorted_array, first_index, last_index): if first_index == last_index: return first_index pivot = unsorted_array[first_index] pivot_index = first_index index_of_last_element = last_index less_than_pivot_index = index_of_last_element greater_than_pivot_index = first_index + 1 while True: while unsorted_array[greater_than_pivot_index] < pivot and greater_than_pivot_index < last_index: greater_than_pivot_index += 1 while unsorted_array[less_than_pivot_index] > pivot and less_than_pivot_index >= first_index: less_than_pivot_index -= 1 if greater_than_pivot_index < less_than_pivot_index: ...
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