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57 lines
2.0 KiB
Python
57 lines
2.0 KiB
Python
#!/usr/bin/env python
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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 by distributing the
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# elements of an array into a number of buckets. Each bucket is then sorted individually, either using
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# a different sorting 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 significant digit flavour.
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# Bucket sort is a generalization of pigeonhole sort. Bucket sort can be implemented with comparisons
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# and therefore can also be considered a comparison sort algorithm. The computational complexity estimates
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# involve the number of buckets.
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# Time Complexity of Solution:
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# Best Case O(n); Average Case O(n); Worst Case O(n)
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from P26_InsertionSort import insertionSort
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import math
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DEFAULT_BUCKET_SIZE = 5
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def bucketSort(myList, bucketSize=DEFAULT_BUCKET_SIZE):
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if(len(myList) == 0):
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print('You don\'t have any elements in array!')
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minValue = myList[0]
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maxValue = myList[0]
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# For finding minimum and maximum values
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for i in range(0, len(myList)):
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if myList[i] < minValue:
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minValue = myList[i]
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elif myList[i] > maxValue:
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maxValue = myList[i]
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# Initialize buckets
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bucketCount = math.floor((maxValue - minValue) / bucketSize) + 1
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buckets = []
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for i in range(0, bucketCount):
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buckets.append([])
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# For putting values in buckets
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for i in range(0, len(myList)):
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buckets[math.floor((myList[i] - minValue) / bucketSize)].append(myList[i])
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# Sort buckets and place back into input array
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sortedArray = []
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for i in range(0, len(buckets)):
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insertionSort(buckets[i])
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for j in range(0, len(buckets[i])):
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sortedArray.append(buckets[i][j])
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return sortedArray
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if __name__ == '__main__':
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sortedArray = bucketSort([12, 23, 4, 5, 3, 2, 12, 81, 56, 95])
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print(sortedArray)
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