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Deleting specific nodes in a linked list I am trying to implement a function in

ID: 3550945 • Letter: D

Question

Deleting specific nodes in a linked list


I am trying to implement a function in a linked list based priority queue where i find the node with the lowest value, return the value and then delete it from the linked list.  This is all i have so far.  As it is right now, it's not returning the right value.  I think i'm in the right direction though.  My main concern is being able to refer to the value's index.  



class priorityQueueLL
{
private:
    class node
    {
    public:
        int data;
        node* next;
    };
    
    node* pFront;
    node* pRear;
    int count;
    
public:
    
    priorityQueueLL();  //constructor
  
    //remove and return smallest item
    int extractMin();
};

///////////////////////////////////////////////////THIS CODE HERE/////////////////////////////////////////////////////
priorityQueueLL::priorityQueueLL(){
    
    count = 0;
    pFront = pRear = NULL;
}


int priorityQueueLL::extractMin(){
    
    int minValue = pFront->data;
    node* pCurrent = pFront;
    
    while (pCurrent != NULL)
    {
        pCurrent = pCurrent->next;
        
        if (pCurrent->data < minValue)

        {
           pCurrent->data = minValue;
        }
    }
    
    
    return minValue;
    
}

Explanation / Answer

Only one line (the commented line) has to be changed in the extractMin function, the corrected function is as follows:


int priorityQueueLL::extractMin(){

int minValue = pFront->data;
node* pCurrent = pFront;

while (pCurrent != NULL)
{
pCurrent = pCurrent->next;

if (pCurrent->data < minValue)

{

minValue=pCurrent->data; // this line u had written opposite
}
}


return minValue;

}

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