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insert nod, new, into sorted priority queue
4. Priority Queue (3 points) Suppose linked list as follows: we define a priority queue using a circular doubly / Linked list node */ /* info stored in this node / /* Pointer to the next node in linked list /*Cor the front node of LL if this is the rear node) / struct node f int info; struct node *next; Pointer to the next node in linked list / /*Cor the rear node of LL if this is the front node) / node *prev j: /*Priority queue */ /*Number of elements in queue */ struct pq f int size; struct node *front /* Pointer to the first node / struct node rear* Pointer to the last node / J; te an iterative (i.e.. given node, new, into a sorted priority queue. void insert (struct pg *queue, struct node *new) ( ne
Expert Answer
void insert(struct pq *queue, struct node *new){
struct node *ptr;
ptr = queue->front;
if (ptr == NULL){
new->prev = new;
new->next = new;
queue->front = new;
queue->rear = new;
return;
}
if (ptr->info > new->info){
new->next = ptr;
new->prev = ptr->prev;
ptr->prev = new;
queue->front = new;
}
else {
while (ptr != NULL && ptr->info < new->info){
ptr = ptr->next;
}
if (ptr == NULL){
new->next = queue->rear->next;
new->prev = queue->rear;
queue->rear->next = new;
queue->rear = new;
}
else {
new->next = ptr;
ptr->prev->next = new;
new->prev = ptr->prev;
ptr->prev = new;
}
}
}
