Question: Consider an implementation of a stack ADT using an extendable array, but instead of doubling the size, when an array of size N is

Consider an implementation of a stack ADT using an extendable array, but 

Consider an implementation of a stack ADT using an extendable array, but instead of doubling the size, when an array of size N is full, you create a new array of size N + 4. Assume you start with an array of size 0 (i.e., the first push is a special push): (a) (1 marks) What is the cost of the 5th push? b) (1 mark) How many normal push can be performed between any two special push? (c) (2 marks) What is the cost of the i-th special push? (d) (2 marks) What is the overall cost of performing n push (give the exact formula as well as the big Oh characterization)?

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