1. C Program To Implement Double Ended Queue Using Linked Listings
2. Double Ended Queue In C
3. C Program To Implement Double Ended Queue Using Linked Listing
4. Double Ended Queue Using Array In C++
5. C Program To Implement Double Ended Queue Using Linked List

• Stack, Bracket checker program, Polish Notations infix to postfix conversion, FIFO Queue, Circular Queue, Double Ended Queue, Linked List - Linear, double and Circular - all operations, Stack and Queue using Linked List; What is stack, algorithms for Push and Pop operation. Implementation of Stack data structure using C.
• Linked list is a data structure consisting of a group of nodes which together represent a sequence. Here we need to apply the application of linkedlist to perform basic operations of queue. Here is source code of the C Program to implement queue using linked list. The C program is successfully compiled and run on a.

C Program To Implement Double Ended Queue Using Linked Listings

It's an exercise from CLRS 3rd:

Implementation of Deque using doubly linked list Deque or Double Ended Queue is a generalized version of Queue data structure that allows insert and delete at both ends. In previous post Implementation of Deque using circular array has been discussed. /* c++ program to implement double ended queue using doubly linked list with.

10.2-3 Implement a queue by a singly linked list L. The operations ENQUEUE and DEQUEUE should still take O(1) time.

It's not hard to implement a queue using a singly linked list. My problem is about the time complexity. How to implement ENQUEUE and DEQUEQUE that take O(1)?

Dequeue using linked list in C. Get all solutions of any problem related to Programming in C,JAVA language.

What I found on google is something like using pointers to track both head and tail. Now the problem becomes how to track head and tail on a singly linked list using O(1) time? IMHO it takes O(n) to track the tail. Am I right?

Yue WangYue Wang

3 Answers

It will take O(1) time to manage the head and tail pointers.

Enqueue:

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Dequeue:

Note: You will also have to perform bounds checking and memory allocation / de-allocation before carrying out pointer assignments

Abhishek BansalAbhishek Bansal

it is easy, simply enque at the end and deque at the front, and setup 2 pointer(or unique_ptrs) pointing to end and front, that will do. like this:

Above is only a demonstration code, yet you can see that you don't need to iterate through the entire list to enque or deque.

std::list is what you're looking for if you're allowed to use std containers.

If not (I assume that's the case), try answering the question: why do you need to perform n operations? Can you just store the pointer to the end?

Smash bros reddit. Say, you have a signly linked list and a pointers head and tailA list item has next pointer.

• If you enqueue a new item, you just add a new item, amend the former 'first' item's next pointer and repoint the head pointer to the new item. That's 3 operations = O(1)
• If you dequeue an item, you move the last pointer to the one pointed on by the last item's next pointer` and delete the item - 2 operations = O(1)

DarkWanderer

Double Ended Queue In C

DarkWanderer

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In this tutorial you will learn about double ended queue (dequeue) in C.

What is Dequeue?

Also Read: Circular Queue in C

C Program To Implement Double Ended Queue Using Linked Listing

Operations on a Dequeue

Double Ended Queue (Dequeue) in C

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#include<process.h> { intrear,front; intempty(dequeue*p); voidenqueueR(dequeue*p,intx); intdequeueF(dequeue*p); voidprint(dequeue*p); voidmain() inti,x,op,n; { printf('n1.Createn2.Insert(rear)n3.Insert(front)n4.Delete(rear)n5.Delete(front)'); printf('n6.Printn7.ExitnnEnter your choice:'); { scanf('%d',&n); printf('nEnter the data:'); for(i=0;i<n;i++) scanf('%d',&x); { exit(0); enqueueR(&q,x); break; case2:printf('nEnter element to be inserted:'); { exit(0); break; case3:printf('nEnter the element to be inserted:'); { exit(0); break; case4:if(empty(&q)) printf('nQueue is empty!!'); } x=dequeueR(&q); break; case5:if(empty(&q)) printf('nQueue is empty!!'); } x=dequeueF(&q); break; case6:print(&q); } } voidinitialize(dequeue*P) P->rear=-1; } intempty(dequeue*P) if(P->rear-1) } intfull(dequeue*P) if((P->rear+1)%MAXP->front) } voidenqueueR(dequeue*P,intx) if(empty(P)) P->rear=0; P->data[0]=x; else P->rear=(P->rear+1)%MAX; } { { P->front=0; } { P->data[P->front]=x; } intdequeueF(dequeue*P) intx; x=P->data[P->front]; if(P->rearP->front)//delete the last element else } intdequeueR(dequeue*P) intx; x=P->data[P->rear]; if(P->rearP->front) else } voidprint(dequeue*P) if(empty(P)) printf('nQueue is empty!!'); } inti; { i=(i+1)%MAX; }

1.Create
2.Insert(rear)
3.Insert(front)
4.Delete(rear)

Double Ended Queue Using Array In C++

5.Delete(front)
6.Print
7.Exit

Enter your choice:1

Enter number of elements:3

Enter the data:4 6 7

1.Create
2.Insert(rear)
3.Insert(front)
4.Delete(rear)
5.Delete(front)
6.Print
7.Exit

Enter your choice:6

4
6
7

1.Create
2.Insert(rear)
3.Insert(front)
4.Delete(rear)
5.Delete(front)
6.Print
7.Exit

Enter your choice:4

Element deleted is 7

1.Create
2.Insert(rear)
3.Insert(front)
4.Delete(rear)
5.Delete(front)
6.Print
7.Exit

Enter your choice:7

C Program To Implement Double Ended Queue Using Linked List