Need to implement by python programming and other answers


(Including python code) Need all complete answers, thank you.

Design a generic local cache with the following property: if the cache is asked for a key that it doesn’t contain, it should fetch the data using an externally provided function that reads the data from another source (database or similar). Note that from the client perspective, the cache is read-only; it should be populated autonomously and dynamically as clients request data from the cache.

What features do you think such a cache should offer? How, in general lines, would you implement it?

Suppose we have a corpus of documents with integer identifiers and an inverted index, which maps words to Skip Lists of document identifiers (If you haven’t encountered skip lists in the past, feel free to google it). Our skip list implements the following interface:

1. getDocld() – returns the identifier of the document in the current position of the skip list cursor.

2. skipTo(docld) – moves the cursor to the first position where the document identifier is equal or greater than the docld parameter.

3. skipToNext() – move the skip list cursor to the next position. A possible implementation of this function is by calling skipTo(getDocld() + 1).

A. Describe an algorithm which, given a query of two words, returns all document identifiers of the documents that contain the two words.

B. Describe an algorithm which, given a query of N words, returns all document identifiers of the documents that contain all N words.

C. Describe an algorithm which, given a query of N words, returns all document identifiers of the documents that contain at least K words.

An emphasis will be given to the time and space complexity of the solutions.

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