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POCan Priority Queues have empty elements (like arrays)?
 

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  1. POCan Priority Queues have empty elements (like arrays)?
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    <p>Hi I am writing an algorithm in algorithm design language for a mock test, for adding an element to a priority-queue. </p> <p>Now I plan to do this by using the general method of inserting an element into a regular queue at the back and then sorting it into correct place by comparing it (according to priority value) to the element that is positioned before it in the priority-queue.</p> <p>This is the algorithm I have so far (only for adding items to the priority-queue):</p> <ul> <li><em>element</em>- element to be added to the queue.</li> <li><em>queue[ ]</em>- priority queue element is being added to.</li> <li><em>n</em>- the size of the priority queue.</li> <li><em>tail</em>- the last element in the priority queue.</li> </ul> <p><strong>procedure</strong> AddQ (<strong>IN</strong> element, <strong>INOUT</strong> queue[ ], <strong>IN</strong> n, <strong>INOUT</strong> tail) </p> <pre><code>if tail= n then print (“Queue is full”) else { tail← tail+ 1 queue (tail) ← element } </code></pre> <p><strong>end</strong></p> <p>What I am not sure of is should I have the section which prints that the Queue is full. Am I right is thinking that priority queues have a pointer in the tail element pointing to null to say that there are not elements left?</p> <p>If so does this mean that priority-queues cannot have empty space (like a standard array for example)for new elements as the tail in the priority-queue points to null, saying no more elements are in the queue? Or am I taking the wrong approach here?</p> <p>I am confused as to how this works, if someone could clarify I would be very grateful! Thankyou.</p>
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