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-rw-r--r--aoc2023/src/day14/solve.gleam94
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diff --git a/aoc2023/src/day14/solve.gleam b/aoc2023/src/day14/solve.gleam
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--- a/aoc2023/src/day14/solve.gleam
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-import adglent.{First, Second}
-import gleam/dict
-import gleam/int
-import gleam/io
-import gleam/list
-import gleam/order
-import gleam/string
-
-fn parse(input) {
- input
- |> string.split("\n")
- |> list.map(string.to_graphemes)
- |> list.transpose()
-}
-
-fn roll_boulders(strs: List(String)) {
- {
- use chunks <- list.map(list.chunk(strs, fn(c) { c == "O" || c == "." }))
- list.sort(chunks, order.reverse(string.compare))
- }
- |> list.flatten
-}
-
-fn score(matrix) {
- use acc, col <- list.fold(matrix, 0)
- acc
- + {
- use col_acc, char, n <- list.index_fold(list.reverse(col), 0)
- case char {
- "O" -> col_acc + n + 1
- _ -> col_acc
- }
- }
-}
-
-pub fn part1(input: String) {
- input
- |> parse
- |> list.map(roll_boulders)
- |> score()
- |> string.inspect
-}
-
-fn rotate(matrix) {
- matrix
- |> list.map(list.reverse)
- |> list.transpose
-}
-
-fn spin(matrix) {
- use acc, _ <- list.fold(list.range(1, 4), matrix)
- acc
- |> list.map(roll_boulders)
- |> rotate
-}
-
-fn spin_cycle(matrix) {
- let cache = dict.new()
- check_if_seen(matrix, cache, 1_000_000_000)
-}
-
-fn check_if_seen(matrix, cache, count) {
- case dict.get(cache, matrix) {
- Error(Nil) ->
- check_if_seen(spin(matrix), dict.insert(cache, matrix, count), count - 1)
- Ok(n) -> {
- let assert Ok(extra) = int.modulo(count, n - count)
- list.fold(list.range(1, extra), matrix, fn(acc, _) { spin(acc) })
- |> score
- }
- }
-}
-
-pub fn part2(input: String) {
- input
- |> parse
- |> spin_cycle
- |> string.inspect
-}
-
-pub fn main() {
- let assert Ok(part) = adglent.get_part()
- let assert Ok(input) = adglent.get_input("14")
- case part {
- First ->
- part1(input)
- |> adglent.inspect
- |> io.println
- Second ->
- part2(input)
- |> adglent.inspect
- |> io.println
- }
-}