43 lines
1.1 KiB
OCaml
43 lines
1.1 KiB
OCaml
type line = {first: int; second: int; char: char; pass: string}
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let parse_line str = Scanf.sscanf str "%d - %d %c : %s"
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(fun first second char pass -> {first; second; char; pass})
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let count_str c str =
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let res = ref 0 in
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String.iter (fun d -> if c = d then incr res) str;
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!res
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let ok1 {first; second; char; pass} =
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let res = count_str char pass in
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res >= first && res <= second
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let ok2 {first; second; char; pass} =
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(pass.[first - 1] = char) <> (pass.[second - 1] = char)
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let main' ok input =
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let count_all = ref 0 in
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let count_ok = ref 0 in
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let check l =
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incr count_all;
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if ok l then incr count_ok in
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Bracket.infile_iter_lines input ~line:parse_line ~iter:check;
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Printf.printf "%d out of %d ok\n" !count_ok !count_all
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let mains = [|main' ok1; main' ok2|]
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let main = function
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| [part; input] -> mains.(int_of_string part - 1) input
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| _ -> Usage.exit_default 2
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let%expect_test "part 1" =
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mains.(0) "../../data/day2";
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[%expect{| 607 out of 1000 ok |}]
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let%expect_test "part 2" =
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mains.(1) "../../data/day2";
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[%expect{| 321 out of 1000 ok |}]
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