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Changed QuickSort.py
Converted all indentations to spaces (different files had spaces or tabs)
This commit is contained in:
Tony Sappe
parent
b7eae6b0e3
commit
37ddd2c8d0
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@ -20,5 +20,5 @@ def main():
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sequential_search(inputs, target)
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if __name__ == '__main__':
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print('==== Insertion Sort ====\n')
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print('==== Linear Search ====\n')
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main()
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40
QuickSort.py
40
QuickSort.py
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@ -1,31 +1,33 @@
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def quicksort(A, p, r):
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def quick_sort(A, p, r):
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if p < r:
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q = partition(A, p, r)
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quicksort(A, p, q - 1)
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quicksort(A, q + 1, r)
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quick_sort(A, p, q - 1)
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quick_sort(A, q + 1, r)
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return A
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def partition(A, p, r):
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x = A[r]
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i = p - 1
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for j in range(p, r):
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if A[j] <= x:
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if A[j] <= A[r]:
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i += 1
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tmp = A[i]
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A[i] = A[j]
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A[j] = tmp
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tmp = A[i+1]
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A[i+1] = A[r]
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A[r] = tmp
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A[i], A[j] = A[j], A[i]
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A[i + 1], A[r] = A[r], A[i + 1]
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return i + 1
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if __name__ == "__main__":
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print('Enter values seperated by space:')
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A = [int (item) for item in input().split(' ')]
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# A = [23, 45, 43, 12, 67, 98, 123, 99]
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# partition(A, 0, 7)
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print(A)
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quicksort(A, 0, 7)
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print(A)
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def main():
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try:
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print("Enter numbers separated by spaces")
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s = raw_input()
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inputs = list(map(int, s.split(' ')))
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except Exception as e:
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print(e)
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else:
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sorted_input = quick_sort(inputs, 0, len(inputs) - 1)
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print('\nSorted list (min to max): {}'.format(sorted_input))
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if __name__ == '__main__':
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print('==== Quick Sort ====\n')
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main()
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27
README.md
27
README.md
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@ -1,14 +1,13 @@
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# The Algoritms - Python
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### **All Algorithms implemented in Python!**
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### All Algorithms implemented in Python!
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These are for demonstration purposes only. There are many implementations of sorts in the Python standard library that are much better for performance reasons.
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## Sorting
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## Sorting Algorithms
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### Binary
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Add comments here
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### Bubble
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![alt text][bubble-image]
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@ -16,7 +15,6 @@ These are for demonstration purposes only. There are many implementations of sor
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From [Wikipedia][bubble-wiki]: Bubble sort, sometimes referred to as sinking sort, is a simple sorting algorithm that repeatedly steps through the list to be sorted, compares each pair of adjacent items and swaps them if they are in the wrong order. The pass through the list is repeated until no swaps are needed, which indicates that the list is sorted.
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__Properties__
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* Stable
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* Worst case performance O(n^2)
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* Best case performance O(n)
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* Average case performance O(n^2)
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@ -26,7 +24,7 @@ __Properties__
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### Caesar
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Add comments here
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### Insertion
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![alt text][insertion-image]
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@ -34,7 +32,6 @@ __Properties__
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From [Wikipedia][insertion-wiki]: Insertion sort is a simple sorting algorithm that builds the final sorted array (or list) one item at a time. It is much less efficient on large lists than more advanced algorithms such as quicksort, heapsort, or merge sort.
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__Properties__
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* Stable
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* Worst case performance O(n^2)
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* Best case performance O(n)
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* Average case performance O(n^2)
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@ -43,6 +40,18 @@ __Properties__
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###### View the algorithm in [action][insertion-toptal]
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## Quick
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![alt text][quick-image]
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From [Wikipedia][quick-wiki]: Quicksort (sometimes called partition-exchange sort) is an efficient sorting algorithm, serving as a systematic method for placing the elements of an array in order.
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__Properties__
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* Worst case performance O(n^2)
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* Best case performance O(n log n) or O(n) with three-way partition
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* Average case performance O(n^2)
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###### View the algorithm in [action][quick-toptal]
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[bubble-toptal]: https://www.toptal.com/developers/sorting-algorithms/bubble-sort
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[bubble-wiki]: https://en.wikipedia.org/wiki/Bubble_sort
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@ -51,3 +60,7 @@ __Properties__
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[insertion-toptal]: https://www.toptal.com/developers/sorting-algorithms/insertion-sort
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[insertion-wiki]: https://en.wikipedia.org/wiki/Insertion_sort
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[insertion-image]: https://upload.wikimedia.org/wikipedia/commons/7/7e/Insertionsort-edited.png "Insertion Sort"
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[quick-toptal]: https://www.toptal.com/developers/sorting-algorithms/quick-sort
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[quick-wiki]: https://en.wikipedia.org/wiki/Quicksort
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[quick-image]: https://upload.wikimedia.org/wikipedia/commons/6/6a/Sorting_quicksort_anim.gif "Quick Sort"
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