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68 lines
2.3 KiB
PowerShell
68 lines
2.3 KiB
PowerShell
<#
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.SYNOPSIS
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Measures the speed of BucketSort
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.DESCRIPTION
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This PowerShell script measures the speed of the BucketSort algorithm.
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BucketSort is a sorting algorithm that works by distributing the elements
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of an array into a number of buckets. Each bucket is then sorted individually,
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either using a different sorting algorithm, or by recursively applying the bucket
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sorting algorithm. It is a distribution sort, a generalization of pigeonhole sort
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that allows multiple keys per bucket, and is a cousin of radix sort in the
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most-to-least significant digit flavor. Bucket sort can be implemented with comparisons
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and therefore can also be considered a comparison sort algorithm. The computational
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complexity depends on the algorithm used to sort each bucket, the number of buckets
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to use, and whether the input is uniformly distributed.
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.PARAMETER numIntegers
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Specifies the number of integers to sort
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.EXAMPLE
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PS> ./measure-BucketSort.ps1
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🧭 Sorting 1000 integers by BucketSort took 0.0653755 sec
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.LINK
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https://github.com/fleschutz/PowerShell
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.NOTES
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Author: Markus Fleschutz | License: CC0
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#>
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param([int]$numIntegers = 1000)
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class BucketSort {
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static Sort($targetList) {
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$max = $targetList[0]
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$min = $targetList[0]
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for ($i = 1; $i -lt $targetList.Count; $i++) {
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if ($targetList[$i] -gt $max) { $max = $targetList[$i] }
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if ($targetList[$i] -lt $min) { $min = $targetList[$i]}
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}
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$holder = New-Object object[][] ($max - $min + 1)
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for ($i = 0; $i -lt $holder.Count; $i++) {
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$holder[$i] = @()
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}
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for ($i = 0; $i -lt $targetList.Count; $i++) {
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$holder[$targetList[$i] - $min]+=$targetList[$i]
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}
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$k = 0
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for ($i = 0; $i -lt $holder.Count; $i++) {
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if ($holder[$i].Count -gt 0) {
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for ($j = 0; $j -lt $holder[$i].Count; $j++) {
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$targetList[$k] = $holder[$i][$j]
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$k++
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}
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}
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}
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}
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}
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$list = (1..$numIntegers | foreach{Get-Random -minimum 1 -maximum $numIntegers})
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$stopWatch = [system.diagnostics.stopwatch]::startNew()
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[BucketSort]::Sort($list)
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[float]$elapsed = $stopWatch.Elapsed.TotalSeconds
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"🧭 Sorting $numIntegers integers by BucketSort took $elapsed sec"
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exit 0 # success
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