Solucion On The Queue 3utools

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Implement a queue with three stacks so that each queue operation takes a constant (worst-case) number of stack operations. Warning: high degree of difficulty. I know how to make a queue with 2 stacks but I can't find the solution with 3 stacks. Queue¶ class asyncio.Queue (maxsize=0,., loop=None) ¶ A queue, useful for coordinating producer and consumer coroutines. If maxsize is less than or equal to zero, the queue size is infinite. If it is an integer greater than 0, then yield from put will block when the queue reaches maxsize, until an item is removed by get.

Summary: in this tutorial, you will learn how to implement the C queue data structure using an array.

Solucion On The Queue 3utools

Introduction to queue data structure

A queue is a collection of objects that are added and removed based on the first-in-first-out (FIFO) principle. It means that the first element added to the queue will be the first one to be removed from the queue.

Solucion On The Queue 3utools Free

Don’t be confused a queue with a stack, because a stack works based on the last-in-first-out (LIFO) principle.

Dev c++ plot graph paper. A good example of a queue is a line of customers in front of a shop. A new addition to the queue made to the back of the queue, whereas removal from the queue i.e., the customer who first came first served.

There are two main operations in a queue: enqueue and dequeue.

  • Enqueue: inserts an element into the back of the queue.
  • Dequeue: removes an element from the front of the queue.

C queue implementation

We can implement the queue data structure in C using an array. We add an element to the back of the queue, whereas we remove an element from the front of the queue. Therefore we need two pointers: head and tail to track the front and the back of the queue.

The queue first is empty so we need to initialize the head and tail pointers:

Solucion On The Queue 3utools Online

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{
}

The queue is empty when the head and the tail pointers point to the same position:

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Whenever we enqueue an element, we increase the tail pointer 1 position:

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When we dequeue an element, we increase the head pointer 1 position until the head pointer reaches the tail pointer i.e., the queue is empty.

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The queue is full when the tail and the size of the queue are equal.

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The following program demonstrates the queue data structure:

queue.h

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* File : queue.h
* Purpose: stack header file
#ifndef QUEUE_H_INCLUDED
voidenqueue(int*q,int*tail,intelement);
intempty(inthead,inttail);
voiddisplay(int*q,inthead,inttail);

queue.c

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* File : queue.c
* Purpose: stack header file
/*
*/
{
}
/*
precondition: the queue is not full
voidenqueue(int*q,int*tail,intelement)
q[(*tail)++]=element;
dequeue an element
*/
{
}
/*
*/
{
}
/*
return 1 if the queue is empty, otherwise return 0
intempty(inthead,inttail)
returntailhead;
display queue content
voiddisplay(int*q,inthead,inttail)
inti=tail-1;
printf('%d ',q[i--]);
}

main.c

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* File : main.c
* Purpose: queue program
#include <stdio.h>
{
inthead,tail,element;
/* push elements into stack */
{
scanf('%d',&element);
enqueue(queue,&tail,element);
display(queue,head,tail);
printf('Queue is fullnn');
printf('--Dequeue elements --n');
{
printf('dequeue element %d n',element);
display(queue,head,tail);
printf('Queue is emptyn');
}

The following is the output of the program when we enqueue 1, 2, 3, 4, 5.

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Enteranumber toenqueue:1
Enteranumber toenqueue:2
Enteranumber toenqueue:3
Enteranumber toenqueue:4
Enteranumber toenqueue:5
Queue isfull
--Dequeue elements--
5432
543
54
5

You can download the C queue implementation project in the following link.

C Queue (1995 downloads)

In this tutorial, you have learned how to implement queue data structure in C using an array.

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