16 lines
619 B
OCaml
16 lines
619 B
OCaml
let rec takeFirstN (xs : string list) (n : int) (acc : string) : string =
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match n with
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| 0 -> acc
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| x -> takeFirstN (List.tl xs) (n-1) (acc ^ (List.nth xs 0));;
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let rec joinK (xs : string list) (acc : string list) (k : int) : string list =
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if List.length xs < k then acc
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else joinK (List.tl xs) (acc @ [takeFirstN xs k ""]) k;;
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let longestConsec (xs : string list) (k : int) : string =
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if (List.length xs) == 0 || (List.length xs) < k || k <= 0
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then ""
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else
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let pairs = joinK xs [] k in
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List.fold_left (fun acc i -> if (String.length i) > (String.length acc) then i else acc) "" pairs;;
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