L18_PriorityQueue

L18_PriorityQueue - What are Priority Queues We introduce a...

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What are Priority Queues We introduce a new Data Structure called priority queues . A Queue: Page 1 of 44
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A Priority Queue E N N Q U U E E U U E E Page 2 of 44
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What are Priority Queues In computer science, we use priority queues to store val- ues. 10 8 7 4 3 3 4 7 10 10 8 p r i o r i t y e n q u e u e 7 4 3 P r i o r i t y q u e u e o f i n t e g e r s 23 15 6 4 2 4 6 23 15 2 4 p r i o r i t y d e q u e u e 23 15 6 P r i o r i t y q u e u e o f i n t e g e r s Page 3 of 44
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What are Priority Queues Of course, we also have priority queues of floats, priority queues of shapes, etc. , but we are not going to show them here. P r i o r i t y q u e u e o f f l o a t s P r i o r i t y q u e u e o f s h a p e s P r i o r i t y q u e u e o f Page 4 of 44
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Priority Queue Operations The priority-enqueue operation inserts a new element at an ‘appropriate ’ position of a priority queue, according to the element’s priority . p r i o r i t y - e n q u e u e Page 5 of 44
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Priority Queue Operations The priority-dequeue operation deletes and returns one element in a priority queue, which is always the element with the ‘smallest’ priority. Page 6 o p r i o r i t y - d e q u e u e This element with the ‘smallest’ prior- ity is returned by priority-dequeue .
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BIG DISCOVERY !!! A priority queue is NOT a queue. It is NOT a First-In-First-Out (FIFO) structure. Page 7 of 44 3 p r i o r i t y - e n q u e u e 8 p r i o r i t y - e n q u e u e 10 7 4 3 10 7 4 10 7 4 4 7 10 4 p r i o r i t y - d e q u e u e 8 8 8 3 p r i o r i t y - d e q u e u e 10 7 4 3 10 7
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BIG DISCOVERY !!!
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