42 lines
1.1 KiB
OCaml
42 lines
1.1 KiB
OCaml
let parse_line' f str = Scanf.sscanf str "%d - %d %c : %s%!" f
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type part1 = {min: int; max: int; char: char; pass: string}
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let parse_line1 = parse_line'
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(fun min max char pass -> {min; max; char; pass})
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let count 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 {min; max; char; pass} =
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let res = count char pass in
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res >= min && res <= max
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type part2 = {pos1: int; pos2: int; char: char; pass: string}
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let parse_line2 = parse_line'
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(fun pos1 pos2 char pass -> {pos1 = pos1 - 1; pos2 = pos2 - 1; char; pass})
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let ok2 {pos1; pos2; char; pass} =
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(pass.[pos1] = char) <> (pass.[pos2] = char)
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let main' ~line ~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 = incr count_all; if ok l then incr count_ok in
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Bracket.infile_iter_lines input ~line ~iter:check;
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Printf.printf "%d out of %d ok\n" !count_ok !count_all
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let main1 = main' ~line:parse_line1 ~ok:ok1
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let main2 = main' ~line:parse_line2 ~ok:ok2
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let mains = [|main1; main2|]
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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 "2 <part> <infile>"
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