Description:
1. Word query
The basic word query function is implemented. After entering the entry, the document name of the document that contains the entry is output, in which the context of the output keyword is printed.
2. Simple Boolean query
The query also contains two words in the document, and then, like the word query, the output is the same as the word query.
3. Phrase query
That is, the query contains both words and the two words are adjacent to each other in the document. The output is the same as before.
4. Query of the market
According to the number of occurrences of the word in the document, the number of documents associated with the word is sorted, so that the result of returning is the document that we want to order in order of importance.
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