In this lab, you will use the data structures and algorithms to implement a simple search engine. Your search engine will have the following functions:

String getPage(String url): gets the HTML document of the web page at URL

type getLinks(String page): collects and return all links (URLs) in the web page. You can design what will be the return type.

type addKeyword(): for each word on each page, add to a (keyword, URLs) list or dictionary, excluding articles, pronouns, and prepositions. For example:

computer: http://www.bestbuy.com

For the URLs in the keyword list, sort them by either the number of times the keyword appearing in the pages or the popularity of the pages.

searchKeyword(String keyword): returns a HTML document has links to the URLs which contain the keyword.