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Solve all below question Question 1 Given the head of a linked list, reverse the nodes of the list k at a time, and return

Solve all below question
Question 1
Given the head of a linked list, reverse the nodes of the list k at a time, and return the modified list.
k is a positive integer and is less than or equal to the length of the linked list. If the number of nodes is not a multiple of k then left-out nodes, in the end, should remain as it is.
You may not alter the values in the list's nodes, only nodes themselves may be changed.
Question 2
What is the Chomsky hierarchy?
Question 3
Given a string s, return whether s is a valid number.
An integer number followed by an optional exponent.
A decimal number followed by an optional exponent.
The digits are defined as one or more digits.
Question 4
What is an oracle machine

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