Enqueue python array9/1/2023 ![]() ![]() The first method employs a stack to store queue elements in reverse order, while the second employs recursion to divide the problem into smaller sub-problems. ![]() The article goes over two methods for reversing a queue with standard queue operations. Space Complexity: Because recursive functions use stack internally, the auxiliary space for reversing a queue using a recursive function will be O(n). Time Complexity: The time complexity of using a recursive function to reverse a queue is O(n). At last, push the popped element into the resultant reversed queue.Ĭomplexity Analysis to Reverse a Queue Using Recursion.Call the revQueue function for the remaining queue.Pop an element from the queue if the queue has elements otherwise, return an empty queue.By following this, we are dividing the larger problem into smaller sub-problems. The approach will first remove the front element from the queue and recursively call the reverse function for the remaining queue. Approach 2: Reverse a Queue Using Recursionįor reversing the queue, we will use the concept of recursion. Space Complexity: The space complexity of this approach is O(n) as we use the stack to store all the elements of the queue. Time Complexity: The time complexity of this approach is O(n) as we need to insert all the elements in the stack and then add them to the queue. (The last element of the stack will be the first to be inserted into the queue.)Ĭomplexity Analysis to Reverse a Queue Using a Stack Push an element from the top of the stack to the back of the queue.(The stack’s top element will be the queue’s last element.) Push an element from the front end of the queue into the stack.We use stack because it has the ‘LIFO’ property, which means that the last element inserted into the data structure should be the first element of the reversed queue. One method for reversing the queue is to store the queue elements in a stack so that when we re-insert the queue elements, they are inserted in reverse order. Output 2: Queue = Approach 1: Reverse a Queue Like Stack, Queue is also a linear data structure. The operation for insertion of elements is known as enqueue operation and the operation for deletion of elements is known as dequeue operation. element which is inserted first will be removed first. Queue follows the principle of FIFO (First in First out) i.e. empty(): Returns true if the queue is empty, otherwise false.īefore we get there, let’s go over some fundamental queue data structure concepts.dequeue(): Removes an element from the queue’s front end.enqueue(element): Add an element to the queue’s tail.We must reverse a queue with only standard operations: In this article, we’ll look at how to reverse a queue.
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