mirror of
https://github.com/paradizelost/AdventOfCode2020.git
synced 2024-11-25 02:44:45 -06:00
108 lines
3.5 KiB
PowerShell
108 lines
3.5 KiB
PowerShell
Function Get-StringHash([String] $String,$HashName = "MD5")
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{
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$StringBuilder = New-Object System.Text.StringBuilder
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[System.Security.Cryptography.HashAlgorithm]::Create($HashName).ComputeHash([System.Text.Encoding]::UTF8.GetBytes($String))|%{
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[Void]$StringBuilder.Append($_.ToString("x2"))
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}
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$StringBuilder.ToString()
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}
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function Get-OpenSeatCount {
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param (
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[int]$seatrow,
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[int]$seatnum,
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$seatmap
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)
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# write-host "$(Get-StringHash -String ($seatmap -join ''))"
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$positionstocheck=@{
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'UpperLeft'=@(($seatrow -1),($seatnum -1))
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'UpperMiddle'=@(($seatrow -1),($seatnum))
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'UpperRight'=@(($seatrow -1),($seatnum +1))
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'Left'=@(($seatrow),($seatnum -1))
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'Right'=@(($seatrow),($seatnum +1))
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'LowerLeft'=@(($seatrow +1),($seatnum -1))
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'LowerMiddle'=@(($seatrow +1),($seatnum))
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'LowerRight'=@(($seatrow +1),($seatnum +1))
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}
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#write-host $positionstocheck
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#write-host "SEATROW: $seatrow SEATNUM: $seatnum"
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$adjacentseats=""
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foreach($position in $positionstocheck.keys){
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$thisrow, $thisseat = $positionstocheck[$position]
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if($thisrow -eq -1){
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continue
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}
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if($thisrow -gt $seatmap.count -1){
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continue
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}
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if($thisseat -eq -1){
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continue
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}
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if($thisseat -gt $seatmap[$seatrow].length -1){
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continue
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}
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$myposition = $positionstocheck[$position]
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$row = $myposition[0]
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#write-host "$row"
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$seat = $myposition[1]
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#write-host "$seat"
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#write-host $seatmap[$row]
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$myrow = $seatmap[$row].ToCharArray()
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$adjacentseats += $myrow[$seat]
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}
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#write-host $adjacentseats
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return ($adjacentseats.tochararray()|?{$_ -eq '#'}).count
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}
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function proc-Seats(){
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param(
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$seatmap
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)
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$origmap = $seatmap.clone()
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#$myseatmap= $seatmap.clone()
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#$myseatmap=$seatmap
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for($row=0;$row -lt $seatmap.count; $row++){
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for($seatnum=0; $seatnum -lt ($seatmap[$row].ToCharArray().count); $seatnum++){
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if($seatmap[$row][$seatnum] -ne '.'){
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$occupiedseats = Get-OpenSeatCount -seatrow $row -seatnum $seatnum -seatmap $origmap
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#write-host "Occupied Around $occupiedseats, SEATNUM $seatnum, SEATROW $row"
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if( $occupiedseats -ge 4){
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#write-host $occupiedseats
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$myrow = $seatmap[$row].tochararray()
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$myrow[$seatnum]='L'
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$seatmap[$row]=$myrow -join ""
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} elseif ($occupiedseats -eq 0) {
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#write-host $occupiedseats
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$myrow = $seatmap[$row].tochararray()
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$myrow[$seatnum]='#'
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$seatmap[$row]=$myrow -join ""
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}
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}
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}
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}
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$seatmap
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}
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$seatmap = @(get-content .\aocd11input.txt)
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#$seatmap=@('L.LL.LL.LL','LLLLLLL.LL','L.L.L..L..','LLLL.LL.LL','L.LL.LL.LL','L.LLLLL.LL','..L.L.....','LLLLLLLLLL','L.LLLLLL.L','L.LLLLL.LL')
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$repeat=$false
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$loopnum=0
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$optionhashes = @()
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do{
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$maphash =Get-StringHash -String ($seatmap -join '')
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$loopnum++
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write-host "Loop $loopnum"
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write-host $maphash
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$seatmap = @(proc-Seats -seatmap $seatmap)
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$seatmap
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if($optionhashes -contains $maphash ){
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write-host "Repeat detected. Stopping"
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$repeat=$true
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} else {
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$optionhashes += $maphash
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}
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#read-host
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} while (
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$repeat -eq $false
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)
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(($seatmap -join "").tochararray()|?{$_ -eq '#'}).count
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