34 lines
858 B
Text
34 lines
858 B
Text
module StrSet = Set.Make(String)
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let str_rev s =
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let len = String.length s in
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let r = Bytes.create len in
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for i = 0 to len - 1 do
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Bytes.set r i s.[len - 1 - i]
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done;
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Bytes.to_string r
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let input_line_opt ic =
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try Some (input_line ic)
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with End_of_file -> close_in ic; None
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let () =
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let ic = open_in "unixdict.txt" in
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let rec aux set acc =
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match input_line_opt ic with
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| Some word ->
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let rev = str_rev word in
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if StrSet.mem rev set
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then aux set ((word, rev) :: acc)
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else aux (StrSet.add word set) acc
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| None ->
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(acc)
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in
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let pairs = aux StrSet.empty [] in
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let len = List.length pairs in
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Printf.printf "Semordnilap pairs: %d\n" len;
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Random.self_init ();
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for i = 1 to 5 do
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let (word, rev) = List.nth pairs (Random.int len) in
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Printf.printf " %s %s\n" word rev
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done
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