Mercurial > lbo > hg > aoc22
changeset 66:2746741a49f6
Day 13 Part 1
| author | Lewin Bormann <lbo@spheniscida.de> |
|---|---|
| date | Sat, 23 Dec 2023 19:58:38 +0100 |
| parents | f2fb41098579 |
| children | b4d590e70ccd |
| files | 2023/day13.ml 2023/dune 2023/input/13.txt 2023/input/13_test.txt |
| diffstat | 4 files changed, 1477 insertions(+), 0 deletions(-) [+] |
line wrap: on
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/2023/day13.ml Sat Dec 23 19:58:38 2023 +0100 @@ -0,0 +1,112 @@ +open Angstrom +open Base +open Core + +type tile = Ash | Rocks [@@deriving sexp, show, eq] + +(* A field consists of a tile array of size rows * cols *) +type field = { rows : int; cols : int; tiles : tile array } +[@@deriving sexp, show] + +(* convert indices and access field. *) + +let ix_of_rc field r c = (r * field.cols) + c +let rc_of_ix field ix = (ix / field.cols, ix mod field.cols) +let tile_at field r c = field.tiles.(ix_of_rc field r c) + +module Parse = struct + let maybe p = p >>| (fun _ -> ()) <|> return () + let parse_tile = char '.' >>| (fun _ -> Rocks) <|> (char '#' >>| fun _ -> Ash) + + let parse_field = + let parse_row = many1 parse_tile in + let parse_rows = sep_by1 (char '\n') parse_row in + let parse_field rows = + let cols = List.hd_exn rows |> List.length in + let tiles = List.concat rows |> Array.of_list in + { rows = List.length rows; cols; tiles } + in + parse_rows >>| parse_field + + let parse_fields = sep_by1 (string "\n\n") parse_field <* maybe (char '\n') +end + +module Part1 = struct + let get_column field c = Array.init field.rows ~f:(fun r -> tile_at field r c) + let get_row field r = Array.init field.cols ~f:(fun c -> tile_at field r c) + + (* check if mirror axis exists between columns c and c+1 (one-based) *) + let check_mirror_v field c = + let rec check_with_off field c off = + if c - off - 1 < 0 || c + off >= field.cols then + off > 0 && off < field.cols + else + let left = get_column field (c - off - 1) + and right = get_column field (c + off) in + Array.equal equal_tile left right && check_with_off field c (off + 1) + in + check_with_off field c 0 + + (* check if mirror axis exists between rows r and r+1 (one-based) *) + let check_mirror_h field r = + let rec check_with_off field r off = + if r - off - 1 < 0 || r + off >= field.rows then + off > 0 && off < field.rows + else + let top = get_row field (r - off - 1) + and bottom = get_row field (r + off) in + Array.equal equal_tile top bottom && check_with_off field r (off + 1) + in + check_with_off field r 0 + + (* check if mirror axis exists between any rows r and r+1 (one-based), + and return r. *) + let check_any_h field = + let rows = List.range 1 (field.rows + 1) in + List.find rows ~f:(fun r -> check_mirror_h field r) + + (* check if mirror axis exists between any columns c and c+1 (one-based), + and return c. *) + let check_any_v field = + let cols = List.range 1 (field.cols + 1) in + List.find cols ~f:(fun c -> check_mirror_v field c) + + (* a symmetry may be either horizontal or vertical or both. + The integer signifies the row/column to the left/top of the + symmetry line. *) + type symmetry = { horizontal : int option; vertical : int option } + [@@deriving sexp, show] + + let check field = + let horizontal = check_any_h field in + let vertical = check_any_v field in + { horizontal; vertical } + + (* check symmetry for all fields *) + let check_all fields = List.map fields ~f:check + + (* calculate score for a single symmetry according to the puzzle rules. *) + let symmetry_to_score { horizontal; vertical } = + let h = Option.value ~default:0 horizontal in + let v = Option.value ~default:0 vertical in + v + (100 * h) + + (* calculate score for each symmetry and sum them up *) + let symmetries_to_score symmetries = + List.map symmetries ~f:symmetry_to_score |> List.fold ~init:0 ~f:( + ) +end + +let () = + let inp = In_channel.(input_all stdin) in + let fields = + Angstrom.parse_string ~consume:All Parse.parse_fields inp + |> Result.ok_or_failwith + in + (* let fields_str = List.map fields ~f:show_field |> String.concat ~sep:"\n\n" in *) + let symmetries = Part1.check_all fields in + (* let symmetries_str = + List.map symmetries ~f:Part1.show_symmetry |> String.concat ~sep:"\n" *) + let score = Part1.symmetries_to_score symmetries in + Out_channel.((*printf "field: %s\n" fields_str;*) + printf "score = %d\n" score) +
--- a/2023/dune Sat Dec 23 17:29:13 2023 +0100 +++ b/2023/dune Sat Dec 23 19:58:38 2023 +0100 @@ -93,3 +93,10 @@ (libraries base core angstrom) (preprocess (pps ppx_let ppx_sexp_conv ppx_compare ppx_deriving.show ppx_deriving.eq))) + +(executable + (name day13) + (modules day13) + (libraries base core angstrom) + (preprocess + (pps ppx_let ppx_sexp_conv ppx_compare ppx_deriving.show ppx_deriving.eq)))
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