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let input_file = "input.txt"
let read_file f =
let ic = open_in f in
try
let lines = really_input_string ic (in_channel_length ic) |> String.trim in
close_in ic;
lines
with e ->
close_in_noerr ic;
raise e
let nums_from_string str =
String.split_on_char ' ' str
|> List.filter (fun ch -> String.length ch > 0)
|> List.map int_of_string
let rec parse ?(result = 0) lines =
match lines with
| [] -> result
| x :: tail ->
let numbers =
List.nth (String.split_on_char ':' x) 1
|> String.split_on_char '|' |> List.map String.trim
|> List.map nums_from_string
in
let winnings = List.nth numbers 0 in
let plays = List.nth numbers 1 in
let k =
Int.shift_left 1
(List.length (List.filter (fun win -> List.mem win plays) winnings)
- 1)
in
parse tail ~result:(result + k)
let () =
let result = read_file input_file |> String.split_on_char '\n' |> parse in
Printf.printf "%d\n" result
|
