diff --git a/day11.ml b/day11.ml new file mode 100644 index 0000000..2a13c9e --- /dev/null +++ b/day11.ml @@ -0,0 +1,104 @@ +(* Common util. Should probably put this in a module or something.. *) +let get_one_line file = + try Some (input_line file) with + End_of_file -> None + +let get_lines file = + let rec input lines = + match get_one_line file with + Some line -> input (line :: lines) + | None -> List.rev lines + in input [] + +let read_file file = + let channel = open_in(file) in + get_lines channel + +let explode s = (* convert a string to a list of chars *) + let rec exp i l = + if i < 0 then l else exp (i - 1) (s.[i] :: l) in + exp (String.length s - 1) [];; + +let print_grid l = + print_newline (); + List.iter (fun line -> + List.iter (Printf.printf "%c") line; + Printf.printf "\n") l + +let (<<) f g x = f(g(x)) + +(* --- *) + +let get_value l (x, y) = (* if in bounds, Some of the value, else None *) + try let row = List.nth l x in + Some (List.nth row y) + with + | Failure _ -> None + | Invalid_argument _ -> None + +let dirs = [(-1, -1); (-1, 0); (-1, 1); (0, -1); (0, 1); (1, -1); (1, 0); (1, 1)] + +let get_neighbors (x, y) l = (* returns list of Options. None means off the grid *) + let coords = List.map (fun (dx, dy) -> (x + dx, y + dy)) dirs in + List.map (get_value l) coords + +let rec walk (x, y) l (dx, dy) = (* walk from (x, y) in direction (dx, dy) until you hit something or fall off *) + let coord = (x + dx, y + dy) in + match get_value l coord with + | Some '.' -> walk coord l (dx, dy) + | a -> a + +let get_far_neighbors (x, y) l = (* returns list of Options. None means off the grid *) + List.map (walk (x, y) l) dirs + +let num_occupied = (* count the number of # in a List of char options *) + List.length << List.filter (function + | None -> false + | Some v -> Char.equal v '#') + +let change_seat is_far (x, y) l = (* is_far is for the 2nd problem *) + let neighbors_fun = if is_far then get_far_neighbors else get_neighbors in + let max_neighbors = if is_far then 5 else 4 in + + let neighbors = neighbors_fun (x, y) l in (* make a list of all neighbors, either near or far *) + match get_value l (x, y) with + | None -> '?' (* eh? *) + | Some 'L' -> if num_occupied neighbors = 0 then '#' else 'L' + | Some '#' -> if num_occupied neighbors >= max_neighbors then 'L' else '#' + | Some s -> s + +let change_seats is_far l = + List.mapi (fun x -> + List.mapi (fun y _ -> + change_seat is_far (x, y) l + ) + ) l + +let hash = Hashtbl.create 1000 + +let grid_equal g1 g2 = (* abusing hash but not a drug problem *) + match Hashtbl.find_opt hash g2 with + | Some _ -> true + | None -> + let _ = Hashtbl.add hash g2 0 in + false + +let rec start is_far grid = (* keep changing seats until the grid stops changing *) + (* print_grid grid; *) + let grid' = change_seats is_far grid in + if grid_equal grid grid' + then grid' + else start is_far grid' + +let () = + let grid = read_file "day11.txt" |> List.map explode in + + start false grid (* false means near-neighbors *) + |> List.flatten + |> List.filter (Char.equal '#') |> List.length (* count occupied seats *) + |> Printf.printf "near-neighbor count %i\n"; + + start true grid + |> List.flatten + |> List.filter (Char.equal '#') |> List.length + |> Printf.printf "far-neighbor count %i\n"; diff --git a/day11.txt b/day11.txt new file mode 100644 index 0000000..f8d32e7 --- /dev/null +++ b/day11.txt @@ -0,0 +1,97 @@ +LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLL..LLLLLLLLLLLL.LLL..LLLLLLLLLLLLLL.LL.LLLLL.LLLLLLLLL.LLLLLLLLLLLLL +LLLLLLL.LLLLLLL.LLLLLLLLL.LLLLL.LLLL.LLLLLLLL.LLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLL..LLLLLLL..LLLL +LLLLLL.LLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLL.LLL.LLLLLLLLLLLLLL.LLLLLLL..LLLLLLLLLLLLLLLLLLLLLL.LLLLL +LLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL..LLLLLLLLL.LLLLLLL..LLLL +.LLL.LL.LLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLL.LLLLLLLLL.LLLLLLLLLLLLL +LL.LLLL.LLLLLLLLLLLLLLLLL.LLLLL.LLLL.LLLLLLLLLLLLL.LLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLL.LLLLL +......L........LLL....L.L......L.LL...L.....L.LL..L..L..L..LLL..LL......L...L.LL.L.L....L......... 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