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design a browser

You are developing a web browser (something like e.g. Netscape, etc.) and need to display all
visited links on a page. The visited links need to use a different color then that used to display
scheme than the unvisited links. Now, given a history of links you have visited before, how
would you go about writing the piece of code that makes the determination if you have seen this
link before? Answer or not? The answer could be a simple string comparison, but then think
about the time it will take for the client to render any HTML page. Alternatively, so, given a
history of URLs, come-up with an elegant way (algorithm, data structures, etc.) to make the
determination if a given link already exists in the history list?
Using a Hash Table is probably the most efficient way to do this. You can use several hashing
algorithms. For example, checksum of a link can be used as a key for hashing. This will ensure o (1)
order provided a good checksum algorithm is used. Whenever a page loads, we can parse all URL's
from the page, take their checksum, and compare them with the hash table. Whichever links match
are then displayed in a different color.
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