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Add incomplete day 9 and complete day 10
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‎day10/Day10Part1.hs‎

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import Data.List
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import Data.Maybe
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openingChars = ['(', '[', '{', '<']
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closingChars = [')', ']', '}', '>']
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scoreForChar :: Char -> Int
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scoreForChar ch
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| ch == ')' = 3
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| ch == ']' = 57
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| ch == '}' = 1197
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| ch == '>' = 25137
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| otherwise = 0
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removeFirst :: Char -> String -> String
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removeFirst _ "" = ""
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removeFirst ch (a:acceptableNextChars)
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| a == ch = acceptableNextChars
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| otherwise = a : removeFirst ch acceptableNextChars
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matching :: Char -> Char
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matching ch
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| ch `elem` openingChars = closingChars !! (fromJust $ elemIndex ch openingChars)
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| ch `elem` closingChars = openingChars !! (fromJust $ elemIndex ch closingChars)
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parseLine :: String -> String -> Char
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parseLine acceptableClosingChars (ch:str)
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| str == [] = if ch `elem` acceptableClosingChars then ' ' else ch
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| ch `elem` openingChars = parseLine ((matching ch):acceptableClosingChars) str
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| ch == acceptableClosingChars!!0 = parseLine (removeFirst ch acceptableClosingChars) str
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| otherwise = ch
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main = do
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contents <- readFile "day10/input.txt"
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let ls = lines contents
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print $ foldl (\acc ch -> acc + scoreForChar ch) 0 (map (parseLine "") ls)

‎day10/Day10Part2.hs‎

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import Data.List
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import Data.Maybe
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openingChars = ['(', '[', '{', '<']
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closingChars = [')', ']', '}', '>']
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scoreForChar :: Char -> Int
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scoreForChar ch
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| ch == ')' = 1
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| ch == ']' = 2
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| ch == '}' = 3
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| ch == '>' = 4
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| otherwise = 0
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removeFirst :: Char -> String -> String
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removeFirst _ "" = ""
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removeFirst ch (a:acceptableNextChars)
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| a == ch = acceptableNextChars
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| otherwise = a : removeFirst ch acceptableNextChars
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matching :: Char -> Char
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matching ch
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| ch `elem` openingChars = closingChars !! (fromJust $ elemIndex ch openingChars)
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| ch `elem` closingChars = openingChars !! (fromJust $ elemIndex ch closingChars)
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parseLine :: String -> String -> String
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parseLine acceptableClosingChars (ch:str)
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-- surely this is just one more iteration of the recursion? no time though
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| str == [] = if ch `elem` openingChars
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then (matching ch):acceptableClosingChars
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else if ch == acceptableClosingChars!!0
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then (removeFirst ch acceptableClosingChars)
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else ""
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| ch `elem` openingChars = parseLine ((matching ch):acceptableClosingChars) str
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| ch == acceptableClosingChars!!0 = parseLine (removeFirst ch acceptableClosingChars) str
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| otherwise = ""
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score :: Int -> String -> Int
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score total (ch:[]) = total * 5 + scoreForChar ch
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score total (ch:str) = score (total * 5 + scoreForChar ch) str
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main = do
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contents <- readFile "day10/input.txt"
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let incomplete = filter (/="") $ map (parseLine "") (lines contents)
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print $ (sort $ map (score 0) incomplete) !! (length incomplete `div` 2)

‎day10/input.txt‎

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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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{<<({{{(<{{<<[{}{})[(){}]>{<<><>><[]{}>}>({({}())[<>[]]}{{{}{}}<<><>>})}}({[[(()){(){}}]({[]()}<<>{}
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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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({(([<<({<<<{([][]){<>()}}<[{}<>]{<>{}}>](<[()<>][[][]]>({()[]}[[][]]))>{[<[[]{}](()())>((<><>)<{}{}>)][
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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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[{({[<{<(<<([{[]<>}([]())]{{(){}}})>{(<{<>{}}(<>{})>{{[]<>}([]())})({<<><>>}({()[]}<{}<>>))}>([
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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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<((({(<[[({({({}{}}{{}[]}})([{[]}({}[])]{[{}()]({}())})}{([{{}{}}(<>[])]<({}[])[<>()]>)[[<
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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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({([{((<[([[<[{}()][()[]}>]{<{<>[]}<{}{}>>[<<>>{()<>}]}]<({{{}<>}{{}<>}}{<<>{}><()<>>})<(([]()
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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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<((({{{([([(<{()[]}[{}()]>)][[[[{}[]][<>{}]][{{}}[()()]]]([[{}<>]]{(<>())(()[])})])[{{(<{}()]<<>()>)[{<><>}[
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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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([[{<[[{[<{[<({})<<>[]>>{{[]<>}[[]{}]}]{([<>[]][[]{}])(<{}><()>)}}{<{{{}[]}<{}{}>}{<<><>>[[]()
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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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{<<[<[(<{([<{[<>{}][{}{}]}({[]()}(()))>(<([]{})><<<>{}><{}<>>>)][{{{[]{}}}[([]<>){[]{}}]}<(<<>
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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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((([{{[(<{{((<{}{}><<><>])[({}<>)[[]<>]]){<{()[]}[[]()]>(([])[{}[]])}}(<[[[]{}][{}[]]][[()[
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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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({[<[[{[(<<[<{[][]}([]<>)>[<<>[]>[()[]]]]<(<{}[]><<>{}>)[<[][]>]>>[[{{<><>}{<>}}<[{}()]{<><>}}]{(<<>{}>
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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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[<<[([{([[({{{()()}({}{})}({()[]}{<>{}})}{[{<>[]}[<>()]]((<><>)({}()))}){[{<{}{}>(<>[])}{{{}<>}}][<([]{})
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[((({<<<<[<([{(){}}(()[])}{{[][]}({}{})})([{{}{}}{[]()}](([]<>){<><>}))><<<<{}[]>(<>[])>{(<>{})[<>
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{<[({<[<[([{<{[][]}<{}{}>>([{}>)}([{[][]}({}[])][[{}()]])]{[[[{}<>]<<>{}>]{<<><>><[][]>}][(
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{({<{[<{[<<[(<<>><<><>>)[<()[]>[{}[]]]]<[(<>[])<{}>]{({}[]){()[]}}>>{[<{[]()}({})>((())[()[]])](<({}<>)

‎day10/sample.txt‎

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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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<{([([[(<>()){}]>(<<{{
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<{([{{}}[<[[[<>{}]]]>[]]

‎day9/Day9Part1.hs‎

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import Data.List
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import Data.Ix
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type Coord = ( Int, Int )
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type Size = Coord
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data Matrix = Matrix { matrixData :: [ Int ]
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, width :: Int
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, height :: Int
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} deriving (Show)
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parse :: [String] -> Matrix
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parse ls = Matrix {matrixData = concat $ [[read (item:"")::Int | item <- row] | row <- ls], width = length $ ls!!0, height = length ls}
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matrixElem :: Coord -> Matrix -> Int
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matrixElem (x, y) matrix
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| x < 0 || y < 0 || x > (width matrix - 1) || y > (height matrix - 1) = -1
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| otherwise = (matrixData matrix) !! (y * (width matrix) + x)
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neighbours :: Coord -> Matrix -> [Int]
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neighbours (x, y) matrix = filter (>=0) [
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matrixElem (x - 1, y) matrix,
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matrixElem (x + 1, y) matrix,
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matrixElem (x, y - 1) matrix,
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matrixElem (x, y + 1) matrix
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]
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lowerThanNeighbours :: Coord -> Matrix -> Bool
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lowerThanNeighbours coord matrix = all (\x -> x > matrixElem coord matrix) (neighbours coord matrix)
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allCoords :: Matrix -> [Coord]
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allCoords matrix = [(x, y) | (y, x) <- range ((0,0), (height matrix - 1, width matrix - 1))]
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lowPoints :: Matrix -> [Coord]
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lowPoints matrix = filter (\coord -> lowerThanNeighbours coord matrix ) (allCoords matrix)
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lowPointValues :: Matrix -> [Int]
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lowPointValues matrix = [(matrixElem coord matrix) + 1 | coord <- lowPoints matrix]
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main = do
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contents <- readFile "day9/input.txt"
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let matrix = parse $ lines contents
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print $ sum $ lowPointValues matrix

‎day9/Day9Part2.hs‎

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-- not working
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import Data.List
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import Data.Ix
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type Coord = ( Int, Int )
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type Size = Coord
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data Matrix = Matrix { matrixData :: [ (Coord, Int) ]
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, width :: Int
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, height :: Int
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} deriving (Show)
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parse :: [String] -> Matrix
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parse ls = Matrix {
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matrixData = zip (allCoords (length $ ls!!0) (length ls)) (concat $ [[read (item:"")::Int | item <- row] | row <- ls]),
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width = length $ ls!!0,
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height = length ls
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}
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allCoords :: Int -> Int -> [Coord]
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allCoords width height = [(x, y) | (y, x) <- range ((0,0), (height - 1, width - 1))]
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matrixValue :: Coord -> Matrix -> (Coord, Int)
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matrixValue (x, y) matrix
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| x < 0 || y < 0 || x >= (width matrix) || y > (height matrix) = ((x, y), -1)
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| otherwise = (matrixData matrix) !! (y * (width matrix) + x)
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neighbours :: Coord -> Matrix -> [(Coord, Int)]
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neighbours (x, y) matrix = filter (\(_, v) -> v >= 0) [
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matrixValue (x - 1, y) matrix,
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matrixValue (x + 1, y) matrix,
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matrixValue (x, y - 1) matrix,
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matrixValue (x, y + 1) matrix
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]
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lowerThanNeighbours :: Coord -> Matrix -> Bool
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lowerThanNeighbours coord matrix = all (\(c, v) -> v > snd (matrixValue coord matrix)) (neighbours coord matrix)
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lowPoints :: Matrix -> [Coord]
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lowPoints matrix = filter (\coord -> lowerThanNeighbours coord matrix ) [coord | (coord, _) <- matrixData matrix]
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-- basin lowPoint
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-- - take all neighbours
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-- - if not 9 and not in the list, add to the list and call basin for this element
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-- - if 9 add nothing
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basinFrom :: Coord -> Matrix -> [Coord] -> [Coord]
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basinFrom coords matrix acc
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| value == 9 = acc
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| length newCoords > 0 = basinFrom (head newCoords) matrix (coords:acc ++ tail newCoords)
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| otherwise = coords:acc
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where ((x, y), value) = matrixValue coords matrix
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newCoords = [c | (c, v) <- neighbours coords matrix, c `notElem` acc, v /= 9]
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main = do
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contents <- readFile "day9/sample.txt"
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let matrix = parse $ lines contents
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print $ matrix
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print $ lowPoints matrix
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-- print $ [basinFrom coord matrix [] | coord <- lowPoints matrix]
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-- putStrLn $ "[]" ++ (show $ neighbours (0, 8) matrix)
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-- putStrLn $ "[((8, 0), 1), ((9, 1), 1)]" ++ (show $ neighbours (9, 0) matrix)
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-- print $ [neighbours n matrix | (n, _) <- neighbours (9, 0) matrix]

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