Reversing a Queue

1.5

Give an algorithm for reversing a queue Q. Only following standard operations are allowed on queue.

  1. enqueue(x) : Add an item x to rear of queue.
  2. dequeue() : Remove an item from front of queue.
  3. empty() : Checks if a queue is empty or not.

Examples:

Input : Q = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
Output :Q = [100, 90, 80, 70, 60, 50, 40, 30, 20, 10]

Input :[1, 2, 3, 4, 5]
Output :[5, 4, 3, 2, 1]

C++

// CPP program to reverse a Queue
#include <bits/stdc++.h>
using namespace std;

// Utility function to print the queue
void Print(queue<int>& Queue)
{
    while (!Queue.empty()) {
        cout << Queue.front() << " ";
        Queue.pop();
    }
}

// Function to reverse the queue
void reverseQueue(queue<int>& Queue)
{
    stack<int> Stack;
    while (!Queue.empty()) {
        Stack.push(Queue.front());
        Queue.pop();
    }
    while (!Stack.empty()) {
        Queue.push(Stack.top());
        Stack.pop();
    }
}

// Driver code
int main()
{
    queue<int> Queue;
    Queue.push(10);
    Queue.push(20);
    Queue.push(30);
    Queue.push(40);
    Queue.push(50);
    Queue.push(60);
    Queue.push(70);
    Queue.push(80);
    Queue.push(90);
    Queue.push(100);

    reverseQueue(Queue);
    Print(Queue);
}

Java

// Java program to reverse a Queue
import java.util.LinkedList;
import java.util.Queue;
import java.util.Stack;

// Java program to reverse a queue
public class Queue_reverse {
    
    static Queue<Integer> queue;

    // Utility function to print the queue
    static void Print()
    {
        while (!queue.isEmpty()) {
            System.out.print( queue.peek() + ", ");
            queue.remove();
        }
    }

    // Function to reverse the queue
    static void reversequeue()
    {
        Stack<Integer> stack = new Stack<>();
        while (!queue.isEmpty()) {
            stack.add(queue.peek());
            queue.remove();
        }
        while (!stack.isEmpty()) {
            queue.add(stack.peek());
            stack.pop();
        }
    }

    // Driver code
    public static void main(String args[])
    {
        queue = new LinkedList<Integer>();
        queue.add(10);
        queue.add(20);
        queue.add(30);
        queue.add(40);
        queue.add(50);
        queue.add(60);
        queue.add(70);
        queue.add(80);
        queue.add(90);
        queue.add(100);

        reversequeue();
        Print();
    }
}
//This code is contributed by Sumit Ghosh


Output

100, 90, 80, 70, 60, 50, 40, 30, 20, 10

This article is contributed by Raghav Sharma. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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