Advent of Code Leaderboard 2023 / Day 3

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Leaderboard

	Name	Language	Tokens Sum	Tokens Part 1	Tokens Part 2	Last change
1	LiquidFun	Python	555	275	280	22 months ago
2	Valentin Slawicek	Kotlin	1198	576	622	22 months ago
3	Visible-Bag4062	C++	10473	473	-	22 months ago

Rules

You're welcome to participate alone or in a team.
You may submit multiple solutions and explore different programming languages.
Stick to the standard library of your language, no further dependencies/libraries, except the ones which OneCompiler provides (e.g. NumPy for Python).
Ensure your code aligns to the template (Python, Rust, Go, Kotlin, JavaScript, C#, TypeScript, C++, Java, C, Swift, Scala, Ruby, Bash), reading the puzzle input from stdin (terminated with end-of-file), and printing the solution to stdout.
Please refrain from making network requests, reading data from files, or storing data in variable/function/class names for reflection.
Your code must be able to process all valid Advent of Code inputs. Golfcoder might reevaluate correctness of your solution with different inputs after your submission.

576 tokens in Kotlin for part 1 by Valentin Slawicek

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sealedclassCharacter(valx:Int,valy:Int)
classSymbol(x:Int,y:Int,valchar:Char,valattachedPartNumbers:MutableList<Int>=mutableListOf()):
Character(x,y)

classEmpty(x:Int,y:Int):Character(x,y)
classDigit(x:Int,y:Int,valdigit:Int,varattachedSymbol:Symbol=null):Character(x,y)

funmain(){
// Parse schematic
valschematic:List<List<Character>>=generateSequence(::readLine)
.toList()
.mapIndexed{x,line->
line.mapIndexed{y,char->
when{
char=='.'->Empty(x,y)
char.isDigit()->Digit(x,y,char.digitToInt())
else->Symbol(x,y,char)
}
}
}

fungetAdjacentCharacters(x:Int,y:Int):List<Character>{
returnlistOfNotNull(
schematic.getOrNull(x-1)?.getOrNull(y-1),
schematic.getOrNull(x-1)?.getOrNull(y),
schematic.getOrNull(x-1)?.getOrNull(y+1),
schematic.getOrNull(x)?.getOrNull(y-1),
schematic.getOrNull(x)?.getOrNull(y+1),
schematic.getOrNull(x+1)?.getOrNull(y-1),
schematic.getOrNull(x+1)?.getOrNull(y),
schematic.getOrNull(x+1)?.getOrNull(y+1),
)
}

funflagDigits(character:Character,symbol:Symbol){
getAdjacentCharacters(character.x,character.y)
.filterIsInstance<Digit>()
.filter{it.attachedSymbol==null}
.forEach{digit->
digit.attachedSymbol=symbol
flagDigits(digit,symbol)
}
}

// Traverse schematic to flag digits with its attached symbol
schematic.forEachIndexed{x,charactersLine->
charactersLine.forEachIndexed{y,character->
if(characterisSymbol){
flagDigits(character,character)
}
}
}

// Traverse schematic to get the final digit sum which have an attached symbol
vardigitSumWithAttachedSymbol=0
schematic.forEachIndexed{x,charactersLine->
valcurrentDigits=mutableListOf<Digit>()

charactersLine.forEachIndexed{y,character->
if(characterisDigit&&character.attachedSymbol!=null){
currentDigits+=character
}else{
// Treat each other character as separator
if(currentDigits.isNotEmpty()){
valpartNumber=currentDigits.joinToString(""){it.digit.toString()}.toInt()
currentDigits.first().attachedSymbol!!.attachedPartNumbers+=partNumber
digitSumWithAttachedSymbol+=partNumber
currentDigits.clear()
}
}
}
// New line is also a separator
if(currentDigits.isNotEmpty()){
valpartNumber=currentDigits.joinToString(""){it.digit.toString()}.toInt()
currentDigits.first().attachedSymbol!!.attachedPartNumbers+=partNumber
digitSumWithAttachedSymbol+=partNumber
currentDigits.clear()
}
}

println(digitSumWithAttachedSymbol)
}