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|
let filename = "./day_01_input.txt"
let () =
let ic = open_in filename in
let try_read () = try Some (input_line ic) with End_of_file -> None in
let rec read_lines left right =
match try_read () with
| Some line -> (
let ints =
Str.split_delim (Str.regexp " ") line |> List.map int_of_string
in
match ints with
| [ a; b ] -> read_lines (a :: left) (b :: right)
| _ -> failwith "invalid")
| None ->
close_in ic;
(List.sort compare left, List.sort compare right)
in
let left, right = read_lines [] [] in
let sum =
List.map2 ( - ) left right |> List.map abs |> List.fold_left ( + ) 0
in
Printf.sprintf "Sum %d" sum |> print_endline;
let sim =
List.map
(fun x -> x * (List.filter (fun y -> x == y) right |> List.length))
left
|> List.fold_left ( + ) 0
in
Printf.sprintf "Sim %d" sim |> print_endline
|
