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Day 10

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This commit is contained in:
Alexander Gehrke 2021-12-12 00:40:27 +01:00
parent 236b015f67
commit be7e1d14de
3 changed files with 159 additions and 1 deletions
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10
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[({(<(())[]>[[{[]{<()<>>
[(()[<>])]({[<{<<[]>>(
{([(<{}[<>[]}>{[]{[(<()>
(((({<>}<{<{<>}{[]{[]{}
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{<[[]]>}<{[{[{[]{()[[[]
[<(<(<(<{}))><([]([]()
<{([([[(<>()){}]>(<<{{
<{([{{}}[<[[[<>{}]]]>[]]

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<([<({{[<{{((<()>({}{})}<({}<>)>)}}>[<{(([()<>]<<>{}>))}<{({<>[]}<<>>)[([]<>)<{}{}>]}>>]]}}[<[{{[{{[<><>]
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(<<<[[<{({<<([{}{}](<><>)){{<><>}(())}>{<{(){}}{[][]}>[{[][]}([]())]}><([{{}[]}[[]{}]](<[]{}><{}<>>))((<(){
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{[(<[{{{<[{({([]{}){{}{}}}[({}<>)])[([()[]]<[]{}>)<[{}{}]{{}()}>]}(<{{{}<>}(()[])}>{{<()<>><[]<>>}
[<<{({[{((({<<<><>>(()())>{{[][]}<{}()>}}[[((){})[{}()]]<[()<>]>]){{(<{}<>>[()<>]){{[][]}(()<>
({[([([<(<<[{<<><>>({}())}[[(){}][[][]]]]>><<(({<><>}{[][]})<{()()}[[]<>]>)[{((){}){{}[]}}(<<>()>{{}()})]><<
[[[{[<({{<[[[<{}{}>(()())]{(<>[])([][])}]({{(){}}})]<[<{{}[]}{()}>[{<><>}]][<((){})([][])>]
[(<{<{(<<<<{{[[][]]<()[]>}){{<<>{}>}}>({[(()())(<>[])]}(<{()()}[<>]>{[[]]<<>()>}))>(<[{({}{})}][{[{}()]
<(<<[([[((<<{<[]{}>{{}<>}}(({}())[[]{}])>(<{<>()}[()()]>>>))]{<{{<(<()<>>{{}()})([{}<>](<><>))>
[{[<[([[<[((([()[]]<{}{}>))<{[{}()][(){}]}([{}<>]<()<>>)>)]>[{((([{}()]{()()>)<(<><>)(()[])>)[(([]()
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[[{<[<(<[[<<({{}()}{{}})(({}{})[[]{}])>[([<>{}]({}<>))])]{<[<[[][]]<()<>>>]{([()()]{<><>})<{[]{}}[[]()]>}><
([<<{({[({[({<{}[]>{{}<>}}){<[<>[]]>[(()())]}]{{{{{}[]>{()<>}}}<[{{}<>}<[]()>]([<>]<<><>>)>}})
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{<[[[[[<[[{{{{()}[[][]]}[<(){}>[[][]]]}(<[{}{}]>)}(<<<()()>{<>}>>)]<([[[()<>]((){})]([[]()]<{}{}>)]([{{}(
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{<<<<{(((<{([{{}{}}][[[]()]<<>()>])<([()<>]([]))[[<><>][{}()]]>}{<{{(){}}<()<>>}<{<>{}}{<>()}>>(<{
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40
src/main/scala/de.qwertyuiop.aoc/2021/day10.scala
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@ -3,4 +3,42 @@ package de.qwertyuiop.aoc.`2021`
import de.qwertyuiop.aoc.lib.*
import cats.*, cats.implicits.given
def day10(using InputSource): Unit = ???
def day10(using InputSource): Unit =
val source = input()
val opposites = Map(
')' -> '(', ']' -> '[', '}' -> '{', '>' -> '<',
'(' -> ')', '[' -> ']', '{' -> '}', '<' -> '>'
)
val errorPoints = Map(
')' -> 3, ']' -> 57, '}' -> 1197, '>' -> 25137,
)
val correctionPoints = Map(
')' -> 1L, ']' -> 2L, '}' -> 3L, '>' -> 4L,
)
def validate(line: String) =
def step(open: List[Char], remain: List[Char]): Either[Char, List[Char]] =
(open, remain) match
case (o, (next @ ('('|'['|'{'|'<')) :: rest) => step(next :: o, rest)
case (lastOpen :: tailOpen, (next @ (')'|']'|'}'|'>')) :: rest) =>
if opposites(next) == lastOpen then
step(tailOpen, rest)
else
Left(next)
case (o, Nil) => Right(o)
case (o, illegalChar:: r) => Left(illegalChar)
step(List(), line.toList)
val checked = source.map(validate)
val totalErrorPoints = checked.collect{ case Left(c) => errorPoints(c)}.sum
val completionsForValid = checked.collect{ case Right(open) => open.map(opposites andThen correctionPoints)}
val allCompletionPoints = completionsForValid.map(_.foldLeft(0L)((total, next) => total * 5L + next)).sorted
println("All Points:")
allCompletionPoints.foreach(println)
println("---")
val middleCompletionPoints = allCompletionPoints(allCompletionPoints.size / 2)
println(totalErrorPoints)
println(middleCompletionPoints)