93 lines
2.6 KiB
OCaml
93 lines
2.6 KiB
OCaml
let ints_of_string ?(sep = " ") s =
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List.map int_of_string (Str.split (Str.regexp sep) s)
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let distance1 a b = abs (a - b)
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let strings_of_file fname =
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In_channel.with_open_text fname In_channel.input_lines
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let string_of_file fname =
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match In_channel.with_open_text fname In_channel.input_line with
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| Some x -> x
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| None -> failwith "Aoc.string_of_file"
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let main prep parts =
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try
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match Sys.argv with
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| [| _; fname |] ->
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let lines = prep fname in
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let do_part i (fmt, fn) =
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Printf.printf "Part %d = %s\n" (i + 1) (fmt (fn lines));
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flush stdout
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in
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List.iteri do_part parts;
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exit 0
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| _ ->
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Printf.printf "Usage: %s <fname>\n" Sys.executable_name;
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exit 2
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with e ->
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Printf.fprintf stderr "An error occured: %s\n" (Printexc.to_string e);
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if Printexc.backtrace_status () then (
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Printf.fprintf stderr "Backtrace:\n";
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Printexc.print_backtrace stderr);
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exit 1
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module IntPair = struct
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type t = int * int
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let compare (x, y) (x', y') =
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match compare y y' with 0 -> compare x x' | c -> c
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end
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module IntPairSet = Set.Make (IntPair)
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module Grid = struct
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type t = { grid : string; width : int; height : int }
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let of_file fname =
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let strs = strings_of_file fname in
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let width = String.length (List.hd strs) in
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let grid = List.fold_left ( ^ ) "" strs in
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let height = String.length grid / width in
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{ grid; width; height }
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let length grid = String.length grid.grid
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let pos_of_idx grid idx = (idx mod grid.width, idx / grid.width)
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let idx_of_pos grid (x, y) = x + (y * grid.width)
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let pos_is_valid grid (x, y) =
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x >= 0 && x < grid.width && y >= 0 && y < grid.height
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let get_by_idx grid idx = grid.grid.[idx]
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let get_by_pos grid pos = get_by_idx grid (idx_of_pos grid pos)
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let get_by_pos_opt grid pos =
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if pos_is_valid grid pos then Some (get_by_pos grid pos) else None
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let idx_from_opt grid = String.index_from_opt grid.grid
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let update_pos grid pos c =
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let idx = idx_of_pos grid pos in
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let builder = Buffer.create (length grid) in
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Buffer.add_string builder (String.sub grid.grid 0 idx);
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Buffer.add_char builder c;
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Buffer.add_string builder
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(String.sub grid.grid (idx + 1) (length grid - idx - 1));
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{ grid with grid = Buffer.contents builder }
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end
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let log10i i =
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let rec impl acc = function 0 -> acc | x -> impl (acc + 1) (x / 10) in
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assert (i > 0);
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impl ~-1 i
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let digits10 = function
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| 0 -> 1
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| n when n > 0 -> 1 + log10i n
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| n (* when n < 0 *) -> 1 + log10i (-n)
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let pow10 n =
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let rec impl acc = function 0 -> acc | x -> impl (acc * 10) (x - 1) in
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assert (n >= 0);
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impl 1 n
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