I suspect that the real challenge here is not so much discovering which paragraphs contain which keywords--though paragraph mode will certainly simplify the process.

But rather, having discovered and recorded which paras contain which words and stored that information in some form; how to determine the minimum set of paras that contain all the keywords.

And given the form in which the OP presented the question, I suspect that s/he is actually stuck for how to even begin to approaching that task.

  1. How to store the information about which words appear in which para.
  2. How to find the minimum set of paras that include all the keywords.

It is an interesting problem that has many possible solutions, but only a few that will be relatively efficient.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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In reply to Re^2: Help required in optimizing the output (PERL) by BrowserUk
in thread Help required in optimizing the output (PERL) by randomid

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