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Q. Perform implementation of a queue using a singly linked list L. The operations INSER and DELETE should take O (1) time.
Ans:
Implementation of queue by using a singly linked list: When implement a queue as a single liked list, a queue q consists of a list and two pointers, q.front and the q.rear. inserting an element is stated below: insert(q,x) { p=getnode(); info(p) = x; next(p) = null; if(q.rear == null) q.front = p; else next(q.rear) = p; q.rear = p; } deletion is stated below: remove(q) { if(empty(q)) { printf("queue overflow"); exit(1); } p=q.front; x=info(p); q.front=next(p); if(q.front == null) q.rear = null; freenode(p); return(x); }
Implementation of queue by using a singly linked list:
When implement a queue as a single liked list, a queue q consists of a list and two pointers, q.front and the q.rear.
inserting an element is stated below:
insert(q,x)
{
p=getnode(); info(p) = x; next(p) = null; if(q.rear == null)
q.front = p;
else
next(q.rear) = p;
q.rear = p;
}
deletion is stated below:
remove(q)
if(empty(q))
printf("queue overflow");
exit(1);
p=q.front; x=info(p); q.front=next(p); if(q.front == null) q.rear = null; freenode(p); return(x);
one to many one to one many to many many to one
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