Question: An inverted file is a critical data structure for implementing applications such an index of a book or a search engine. Given a document D,

An inverted file is a critical data structure for implementing applications such an index of a book or a search engine. Given a document D, which can be viewed as an unordered, numbered list of words, an inverted file is an ordered list of words, L, such that, for each word w in L, we store the indices of the places in D where w appears. Design an efficient algorithm for constructing L from D.

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