Question

How to retrieve these keywords

Asked by: davidw88

Hi experts,
I am working on a keyword retrieval project. Here is an example.

Assume that the following is a keyword file.
Serial Number                     Keywords
10                                       this
11                                       this is
33                                       this is notebook
38                                       This
68                                       Yahoo com
70                                       yahoo is this

Now I have a query string like this:
"This is yahoo com"
Then I should get all the keywords in the keyword file except "This is notebook". The principle is that the keyword(s) is/are retrieved if and only if it/they occur in the query string. Case is ignored. "Yahoo" and "yahoo" are all treated as the same.

Now my question is:
How to design such a data structure and algorithm so that I can retrieve the keywords quickly. This system has a really high requirement for the retrieval time. So the faster is the better.

Please spend some time to consider this question and your answer before you reply. I used hashtable and chaining list but the running time is too long to afford.

Thanks so much.

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Asked On
2008-05-20 at 08:42:28ID23417637
Topic

C Programming Language

Participating Experts
4
Points
500
Comments
43

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