lec-06 - ECE 242 Data Structures and Algorithms Stacks and...

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ECE 242 Data Structures and Algorithms Stacks and Queues I Lecture 6                        Prof. Eric Polizzi                      
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2 DATA STRUCTURES The big picture... so far ALGORITHMS Unordered list Ordered Array Array insert, delete, linear  search, shuffle,  sorting Ordered list insert, delete, shuffle,  binary search Stacks Queues push, pop, peek, etc. insert, remove, etc.
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3 Stacks and Queues- Philosophy They are abstract data structures defined only by their interfaces  (examples: insert, remove, etc.) The underlying mechanism (for example: an array) is not visible  to the user Interfaces are designed to enforce restricted access – only one  item should be removed or added at a time ....  designed to be O(1) These data structures are not appropriate to operate on database,  they are used more often as programmer's tools Once created and used to carry out a particular task, they are often  discarded (short life-time)
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4 Stacks- overview Last In First Out   (LIFO) Stacks allow to get access to the last item inserted. If removed, you get  access to the next-to-last item inserted, and so on.
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