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50 lines
2.0 KiB
Python
50 lines
2.0 KiB
Python
#!/usr/bin/env python
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"""Illustrate how to implement bucket sort algorithm."""
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# Author: OMKAR PATHAK
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# This program will illustrate how to implement bucket sort algorithm
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# Wikipedia says: Bucket sort, or bin sort, is a sorting algorithm that works
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# by distributing the elements of an array into a number of buckets.
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# Each bucket is then sorted individually, either using a different sorting
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# algorithm, or by recursively applying the bucket sorting algorithm. It is a
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# distribution sort, and is a cousin of radix sort in the most to least
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# significant digit flavour.
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# Bucket sort is a generalization of pigeonhole sort. Bucket sort can be
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# implemented with comparisons and therefore can also be considered a
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# comparison sort algorithm. The computational complexity estimates involve the
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# number of buckets.
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# Time Complexity of Solution:
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# Worst case scenario occurs when all the elements are placed in a single bucket. The overall performance
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# would then be dominated by the algorithm used to sort each bucket. In this case, O(n log n), because of TimSort
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#
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# Average Case O(n + (n^2)/k + k), where k is the number of buckets
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#
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# If k = O(n), time complexity is O(n)
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DEFAULT_BUCKET_SIZE = 5
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def bucket_sort(my_list, bucket_size=DEFAULT_BUCKET_SIZE):
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if len(my_list) == 0:
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raise Exception("Please add some elements in the array.")
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min_value, max_value = (min(my_list), max(my_list))
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bucket_count = ((max_value - min_value) // bucket_size + 1)
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buckets = [[] for _ in range(int(bucket_count))]
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for i in range(len(my_list)):
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buckets[int((my_list[i] - min_value) // bucket_size)
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].append(my_list[i])
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return sorted([buckets[i][j] for i in range(len(buckets))
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for j in range(len(buckets[i]))])
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if __name__ == "__main__":
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user_input = input('Enter numbers separated by a comma:').strip()
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unsorted = [float(n) for n in user_input.split(',') if len(user_input) > 0]
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print(bucket_sort(unsorted))
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