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day07.elm
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day07.elm
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module Main exposing (..)
import Array
import Set
import Regex
import Html exposing (program, text, textarea, div, button, pre)
import View exposing (renderProblem)
import Inputs exposing (problemInputs)
main : Program Never Model Msg
main =
program { init = init, view = view, update = update, subscriptions = subscriptions }
subscriptions : Model -> Sub msg
subscriptions model =
Sub.none
type Msg
= Solve
| Solve2
update : Msg -> Model -> ( Model, Cmd msg )
update msg model =
case msg of
Solve ->
let
solution =
solverPart1 model
in
( { model | solutionPart1 = solution }, Cmd.none )
Solve2 ->
let
solution =
solverPart2 model
in
( { model | solutionPart2 = solution }, Cmd.none )
type alias Model =
{ problemDay : Int
, input : String
, solutionPart1 : String
, solutionPart2 : String
}
problemDay : Int
problemDay =
7
init : ( Model, Cmd msg )
init =
( { problemDay = problemDay
, input = Array.get (problemDay - 1) problemInputs |> Maybe.withDefault ""
, solutionPart1 = ""
, solutionPart2 = ""
}
, Cmd.none
)
findAbbas : String -> List String
findAbbas string =
let
abbas =
Regex.find Regex.All (Regex.regex "\\w*(\\w)(\\w)\\2\\1\\w*") string
in
abbas
|> List.map .submatches
|> List.map (List.map (Maybe.withDefault ""))
|> List.map (String.join "")
|> List.filter (\x -> x /= String.reverse x)
|> List.map (\x -> x ++ (x |> String.reverse))
reverseABA : String -> String
reverseABA string =
case String.split "" string of
a :: b :: c :: [] ->
String.concat [ b, a, b ]
_ ->
Debug.crash "Invalid ABA!"
findABAs : String -> List String
findABAs string =
findABAs_ [] string
findABAs_ : List String -> String -> List String
findABAs_ abas string =
let
_ =
string
tail =
String.dropLeft 1 string
in
case String.split "" string of
a1 :: b :: a2 :: t ->
if a1 == a2 && b /= a1 then
findABAs_ ((String.concat [ a1, b, a2 ]) :: abas) tail
else
findABAs_ abas tail
_ ->
abas
supportsSSL : String -> Bool
supportsSSL string =
let
outSideABAS =
string
|> String.split "["
|> List.map (String.split "]")
|> List.map List.reverse
|> List.map List.head
|> List.map (Maybe.withDefault "")
|> List.map findABAs
|> List.concat
|> List.map reverseABA
|> List.foldr Set.insert Set.empty
insideABAS =
Regex.find Regex.All (Regex.regex "\\[(\\w*?)\\]") string
|> List.map .submatches
|> List.map (List.map (Maybe.withDefault ""))
|> List.map (String.join "")
|> List.map findABAs
|> List.concat
|> List.foldr Set.insert Set.empty
in
Set.intersect outSideABAS insideABAS
|> Set.size
|> (<) 0
hasBracketedAbbas : List String -> String -> Bool
hasBracketedAbbas abbas string =
let
bracketedAbbas =
Regex.find Regex.All (Regex.regex "\\[(\\w*?)\\]") string
|> List.map .submatches
|> List.map (List.map (Maybe.withDefault ""))
|> List.map (String.join "")
|> List.filter (\x -> (findAbbas x |> List.length) > 0)
in
List.length bracketedAbbas > 0
supportsTLS : String -> Bool
supportsTLS string =
let
abbas =
findAbbas string
in
case List.length abbas of
0 ->
False
_ ->
if hasBracketedAbbas abbas string then
False
else
True
solverPart1 : Model -> String
solverPart1 model =
model.input
|> String.split ("\n")
|> List.map String.trim
|> List.filter supportsTLS
|> List.length
|> toString
solverPart2 : Model -> String
solverPart2 model =
model.input
|> String.split ("\n")
|> List.map String.trim
|> List.filter supportsSSL
|> List.length
|> toString
view : Model -> Html.Html Msg
view model =
div []
[ renderProblem model ( Solve, Solve2 )
]