mirror of
https://github.com/fleschutz/PowerShell.git
synced 2024-12-27 17:19:16 +01:00
47 lines
1.6 KiB
PowerShell
Executable File
47 lines
1.6 KiB
PowerShell
Executable File
<#
|
|
.SYNOPSIS
|
|
Measures the speed of SelectionSort
|
|
.DESCRIPTION
|
|
This PowerShell script measures the speed of the SelectionSort algorithm.
|
|
SelectionSort is an in-place comparison sorting algorithm. It has an O(n2) time complexity,
|
|
which makes it inefficient on large lists, and generally performs worse than the similar
|
|
insertion sort. Selection sort is noted for its simplicity and has performance advantages
|
|
over more complicated algorithms in certain situations, particularly where auxiliary memory
|
|
is limited.
|
|
.PARAMETER numIntegers
|
|
Specifies the number of integers to sort
|
|
.EXAMPLE
|
|
PS> ./measure-SelectionSort.ps1
|
|
🧭 0.335 sec to sort 1000 integers by SelectionSort
|
|
.LINK
|
|
https://github.com/fleschutz/PowerShell
|
|
.NOTES
|
|
Author: Markus Fleschutz | License: CC0
|
|
#>
|
|
|
|
param([int]$numIntegers = 1000)
|
|
|
|
class SelectionSort {
|
|
static Sort($targetList) {
|
|
$n = $targetList.count
|
|
|
|
for ($i = 0; $i -lt $n; $i++) {
|
|
for ($j = $i + 1; $j -lt $n; $j++) {
|
|
if ($targetList[$j] -lt $targetList[$i]) {
|
|
$tmp = $targetList[$i]
|
|
$targetList[$i] = $targetList[$j]
|
|
$targetList[$j] = $tmp
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
$list = (1..$numIntegers | foreach{Get-Random -minimum 1 -maximum $numIntegers})
|
|
$stopWatch = [system.diagnostics.stopwatch]::startNew()
|
|
[SelectionSort]::Sort($list)
|
|
[float]$elapsed = $stopWatch.Elapsed.TotalSeconds
|
|
$elapsed3 = "{0:N3}" -f $elapsed # formatted to 3 decimal places
|
|
"🧭 $elapsed3 sec to sort $numIntegers integers by SelectionSort"
|
|
exit 0 # success
|