# DS02_Ch03a - 3 Lists Stacks and Queues CHAPTER 1 Abstract...

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CHAPTER 3 Lists, Stacks, and Queues §1 Abstract Data Type (ADT) Definition Data Type = { Objects } { Operations } 【 Example 【 int = { 0, ± 1, ± 2, , INT_MAX, INT_MIN } { + , - , × , ÷ , % , } Definition An Abstract Data Type (ADT) is a data type that is organized in such a way that the specification on the objects and specification of the operations on the objects are separated from the representation of the objects and the implementation on the operations. 1/14

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§2 The List ADT Objects : ( item 0 , item 1 , ⋅ ⋅ ⋅ , item N - 1 ) Operations : Finding the length , N , of a list. Printing all the items in a list. Making an empty list. Finding the k- th item from a list, 0 k < N . Inserting a new item after the k -th item of a list, 0 k < N . Deleting an item from a list. Finding next of the current item from a list. Finding previous of the current item from a list. ADT: Why after? 2/14
1. Simple Array implementation of Lists §2 The List ADT array[ i ] = item i MaxSize has to be estimated. Address Content array+ i item i array+ i +1 item i +1 …… …… …… …… Sequential mapping Find_Kth takes O(1) time. Insertion and Deletion not only take O( N ) time, but also involve a lot of data movements which takes time. 3/14

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§2 The List ADT 2. Linked Lists Address Data Pointer 0010 0011 0110 1011 SUN QIAN ZHAO LI 1011 0010 0011 NULL Head pointer ptr = 0110 ZHAO QIAN SUN LI ptr NULL Initialization: typedef struct list_node *list_ptr; typedef struct list_node { char data [ 4 ] ; list_ptr next ; } ; list_ptr ptr ;
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## This note was uploaded on 10/20/2011 for the course COMPUTER S 10586 taught by Professor Jilinwang during the Spring '09 term at Zhejiang University.

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DS02_Ch03a - 3 Lists Stacks and Queues CHAPTER 1 Abstract...

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