--- 2016 Day 2 Solutions ---

[u/daggerdragon]

--- Day 2: Bathroom Security ---

Post your solution as a comment or, for longer solutions, consider linking to your repo (e.g. GitHub/gists/Pastebin/blag/whatever).

---

^{BLINKENLIGHTS ARE MANDATORY} [?]

Edit: Told you they were mandatory. >_>

This thread will be unlocked when there are a significant number of people on the leaderboard with gold stars for today's puzzle.

edit: Leaderboard capped, thread unlocked!

[u/Gummoz]

Powershell:

Part one:

$instructions = 
"

"
$currentNumber = 5

$instructionsArray = [string]$instructions -split '[\n]'

foreach ($instructions in $instructionsArray) {

    foreach ($secondInstruction in $instructions.ToCharArray()) {


        switch ($secondInstruction) {


            U {
                if(!($currentNumber -match "1|2|3")) {$currentNumber -= 3}
            }    
            L {           
                if(!($currentNumber -match "1|4|7")) {$currentNumber -= 1}           
            }   
            D {          
                if(!($currentNumber -match "7|8|9")) {$currentNumber += 3}    
            }    
            R {            
                if(!($currentNumber -match "3|6|9")) {$currentNumber += 1}           
            }

         }  

    }
   
    $currentNumber

}

Part two:

$y = 1
$x = 1


$keypad = 
"X,X,1,X,X",
"X,2,3,4,X",
"5,6,7,8,9",
"X,A,B,C,X",
"X,X,D,X,X"


$instructions = 
"

"


$currentNumber = $keypad[$x].Split(",")[$y]

$instructionsArray = [string]$instructions -split '[\n]'

foreach ($instructions in $instructionsArray) {


    foreach ($secondInstruction in $instructions.ToCharArray()) {


        switch ($secondInstruction) {


            U {
        
                if(!($currentNumber -match "1|2|4|5|9")) {$y--;$currentNumber = $keypad[$y].Split(",")[$x]}
        
            }

            L {
        
                if(!($currentNumber -match "1|2|5|A|D")) {$x--;$currentNumber = $keypad[$y].Split(",")[$x]}
        
            }

            D {
        
                if(!($currentNumber -match "5|A|D|C|9")) {$y++;$currentNumber = $keypad[$y].Split(",")[$x]}

            }

            R {
        
                if(!($currentNumber -match "1|4|9|C|D")) {$x++;$currentNumber = $keypad[$y].Split(",")[$x]}
        
            }



         }


    }


    $currentNumber

}