commit 1aed72fc094ef794d331f0a1f6a9a2a983028684 · aylac.top/advent_of_code

+75 -23
2025/6/gleam/src/main.gleam
···

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       type Part2Dict =

     

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         dict.Dict(Int, Int)

     

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       type Align {

     

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         Left

     

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         Right

     

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       }

     

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       type Operation {

     

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         Sum

     

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         Mul

     

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       }

     

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       type Part2Line {

     

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         Part2Line(align: Align, op: Operation, numbers: List(String))

     

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       }

     

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       +
       

     

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       pub fn main() {

     

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         let assert Ok(input) = file.read(from: "../input.txt")

     

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           as "Input file not found"

     
···

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           |> int.sum

     

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         echo part_1

     

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       -
         let assert Ok(regex) = regexp.from_string("   *")

     

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         let input_pt_2 = regexp.replace(regex, input, "X ")

     

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       -
       

     

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         echo input_pt_2

     

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         let lines =

     

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           input

     

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           |> string.split("\n")

     

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           |> list.map(fn(i) { string.trim(i) |> string.split(" ") })

     

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           |> list.transpose

     

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       -
       

     

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           |> list.reverse

     

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         let assert Ok(last_line) = list.first(lines)

     

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         let #(_, bounds) =

     

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           { last_line <> "                         *" }

     

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           |> string.to_graphemes

     

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           |> list.index_fold(#(0, list.new()), fn(acc, char, i) {

     

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             let #(bound_start, bounds) = acc

     

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             case char {

     

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               "*" | "+" if i > 0 -> #(i, list.append([#(bound_start, i - 1)], bounds))

     

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               _ -> acc

     

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             }

     

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           })

     

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         let input_pt_2 =

     

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           bounds

     

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           |> list.index_fold(dict.new(), fn(d, bound, i) {

     

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             let numbers =

     

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               list.map(lines, fn(line) {

     

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                 string.slice(line, bound.0, bound.1 - bound.0)

     

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               })

     

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             let align =

     

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               numbers

     

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               |> list.drop(1)

     

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               |> list.fold_until(Left, fn(res, number) {

     

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                 case

     

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                   string.trim(number) == number,

     

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                   string.trim_start(number) == number

     

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                 {

     

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                   True, _ -> list.Continue(res)

     

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                   _, True -> list.Stop(Left)

     

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                   _, _ -> list.Stop(Right)

     

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                 }

     

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               })

     

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             let assert Ok(sign) = list.first(numbers)

     

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             let sign = case string.trim(sign) {

     

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               "*" -> Mul

     

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               "+" -> Sum

     

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               _ -> panic as sign

     

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             }

     

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             dict.insert(

     

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               d,

     

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               i,

     

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               Part2Line(

     

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                 align,

     

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                 sign,

     

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                 numbers |> list.drop(1) |> list.map(string.trim) |> list.reverse,

     

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               ),

     

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             )

     

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           })

     

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         let part_2 =

     

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           input_pt_2

     

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           |> string.split("\n")

     

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           |> list.map(fn(i) { string.trim(i) |> string.split(" ") })

     

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           |> list.transpose

     

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           |> list.index_map(fn(ninput, col) {

     

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             let i = list.reverse(ninput)

     

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             let assert Ok(s) = list.first(i)

     

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             let i = list.drop(i, 1)

     

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             let i = list.reverse(i)

     

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           |> dict.to_list

     

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           |> list.map(fn(i) { i.1 })

     

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           |> list.map(fn(line) {

     

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             let d: Part2Dict = dict.new()

     

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             let d =

     

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               i

     

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               line.numbers

     

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               |> list.fold(d, fn(d, number) {

     

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                 let number_len = string.length(number)

     

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                 string.to_graphemes(number)

     

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                 |> list.index_fold(d, fn(d, digit, index) {

     

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                   let assert Ok(digit) = digit |> int.parse

     

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                   let pos = case col % 2 {

     

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                     0 -> number_len - index

     

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                     _ -> index

     

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                   let pos = case line.align {

     

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                     Right -> number_len - index

     

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                     Left -> index

     

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                   }

     

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                   dict.insert(

     

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                     d,

     
···

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                   )

     

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                 })

     

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               })

     

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             echo #(d, line)

     

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             let numbers =

     

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               dict.to_list(d)

     

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               |> list.map(fn(n) { n.1 })

     

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             let r = case s {

     

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               "+" -> int.sum(numbers)

     

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               "*" -> list.reduce(numbers, int.multiply) |> result.unwrap(0)

     

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               _ -> panic as "invalid"

     

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             let r = case line.op {

     

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               Sum -> int.sum(numbers)

     

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               Mul -> list.reduce(numbers, int.multiply) |> result.unwrap(0)

     

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             }

     

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             r

     

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           })