Question: When a web crawler is exploring the Internet looking for content to index for a search engine, the crawler needs some way of detecting when

When a web crawler is exploring the Internet looking for content to index for a search engine, the crawler needs some way of detecting when it is visiting a copy of a website it has encountered before. Describe a way for a web crawler to store its web pages efficiently so that it can detect in O(n) time whether a web page of length n has been previously encountered and, if not, add it to the collection of previously encountered web pages in O(1) additional time.

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