Read a series of characters from standard input and keep them in a linked list so that there are no duplicates. Put a newly introduced character at the top of the list when you read it in. If you read a character more than once, remove it from the list and put it back in at the beginning. The well-known move-to-front method, which is beneficial for caching, data compression, and many other applications where objects that have been recently accessed are more likely to be reaccessed, is implemented by the programme MoveToFront.

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A: Introduction:

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A: Please refer to the following steps for the complete solution to the problem above.

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A: Answer:

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A: The complete code is given below.

Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.