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