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added day 3

master
lub 3 years ago
commit
6772580e75
  1. 103
      03/day03.ps1

103
03/day03.ps1

@ -0,0 +1,103 @@
param (
[Parameter(position = 0)]
[array]
$Wires = @('R8,U5,L5,D3','U7,R6,D4,L4')
)
function Trace-Wire {
param (
[Parameter(Mandatory,
position = 0)]
[array]
$Steps
)
$path = New-Object -TypeName System.Collections.ArrayList
#start position is 0,0
$position = @{
x = 0
y = 0
distance = $null
}
foreach($step in $Steps) {
$direction = $step.Substring(0, 1)
$count = $step.Substring(1)
for($i = 1; $i -le $count; $i++) {
switch($direction) {
'U' {$position.y += 1}
'D' {$position.y -= 1}
'R' {$position.x += 1}
'L' {$position.x -= 1}
Default {Write-Error ('Unkown $direction: {0}' -f $direction)}
}
$path.Add($position) | Out-Null
#copy position to prevent adjustment of objects already added to $path
$position = $position.Clone()
}
}
return $path
}
function Compare-Paths {
param (
[Parameter(Mandatory,
position = 0)]
[System.Collections.ArrayList]
$PathOne,
[Parameter(Mandatory,
position = 1)]
[System.Collections.ArrayList]
$PathTwo
)
$intersections = New-Object -TypeName System.Collections.ArrayList
foreach($position_one in $path_one) {
foreach($position_two in $path_two) {
if($position_one.x -eq $position_two.x -and $position_one.y -eq $position_two.y) {
$intersections.Add($position_one) | Out-Null
}
}
}
return $intersections
}
function Get-ManhattenDistance {
param (
[Parameter(Mandatory = $false)]
[hashtable]
$Source = @{x = 0; y = 0},
[Parameter(Mandatory,
position = 0)]
[hashtable]
$Destination
)
$distance = [math]::Abs($Source.x) + [math]::Abs($Destination.x)
$distance += [math]::Abs($Source.y) + [math]::Abs($Destination.y)
return $distance
}
# use jobs to trace both wires in parallel
# (,$arr) prevents ArgumentList from splitting $arr
$path_one_job = Start-Job ${function:Trace-Wire} -ArgumentList (,$Wires[0].Split(','))
$path_two_job = Start-Job ${function:Trace-Wire} -ArgumentList (,$Wires[1].Split(','))
# wait for jobs to finish
$path_one = $path_one_job | Receive-Job -Wait -AutoRemoveJob
$path_two = $path_two_job | Receive-Job -Wait -AutoRemoveJob
$intersections = Compare-Paths $path_one $path_two
for($i = 0; $i -lt $intersections.Count; $i++) {
$distance = Get-ManhattenDistance -Destination $intersections[$i]
$intersections[$i].distance = $distance
}
($intersections | Sort-Object -Property distance | Select-Object -First 1).distance
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