1. Advanced Data Structure using C++

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LECTURE NOTES OF ADVANCED DATA STRUCTURE (MT-CSE 110) Implementation 2: Wrapped Configuration EMPTY QUEUE [2] [3] [2] [3] [1] [4] [1] J1 [4] [0] [5] [0] [5] front = 0 front = 0 rear = 0 rear = 3 Can be seen as a circular queue Leave one empty space when queue is full Why? FULL QUEUE FULL QUEUE [2] [3] [2] [3] J2 J3 J8 J9 [1] J1 J4 [4][1] J7 [4] J5 J6 J5 [0] [5] [0] [5] front =0 rear = 5 How to test when queue is empty? How to test when queue is full? J2 J3 front =4 rear =3 Prepared By : Er. Harvinder Singh Assist Prof., CSE, H.C.T.M (Kaithal) Page ‐ 146 ‐
LECTURE NOTES OF ADVANCED DATA STRUCTURE (MT-CSE 110) LINKED LIST BASED QUEUE IMPLEMENTATION A queue represented <strong>using</strong> a linked list is also known as a linked queue. The array based representation of queue suffer from following limitations. • Size of the queue must be known in advance • We may come across situation when an attempt to enqueue an element causes over flow. However, queue as an abstract data structure cannot be full. Hence , abstractly it is always possible to enqueue an element in queue. Therefore, implementing queue as an array prohibits the growth of queue beyond finite number of elements. The link list representation allows a queue to grow to a limit of the computers memory . The following are the necessary declarations Typedef struct nodetype { Int info ; Struct node type *next; } Node; Typedef struct { Node * front ; Node * rear; } Queue; Queue q; Here we have defined two data type name node and queue. The node type , a self referential structure , whose first element info hold the element of the queue and the second element next holds the address of the element after it in the queue .the second type in queue, a structure , whose first element front holds the address of the first element of the queue, and the second element rear holds the address of the last element of the queue. The last line declares a variable q of type queue. Prepared By : Er. Harvinder Singh Assist Prof., CSE, H.C.T.M (Kaithal) Page ‐ 147 ‐
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