When comparing the sentence, "P Q R" (letters represent words) against "A B C D", you need to test the powerset of the short against the longer. Eg.

  1. Does "A B C D" contain "P Q R"?
  2. Does "A B C D" contain "P Q"?
  3. Does "A B C D" contain "Q R"?

That gives 4*3 + 4*2 + 4*2 = 28 (not 4*3=12).

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In reply to Re^3: LCS efficiency problem by BrowserUk
in thread LCS efficiency problem by zhe

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