![]() Because no extra space is required for any operation, the space complexity for each operation in a queue is O(1). What is the complexity of a queue’s space?Īns. Add the elements to q1, then iterate until size-2 of q1 and add these elements to the back end of q1, resulting in the last element in the first position. Algorithm: There are two queues, q1 and q2. Assume q1 contains 1,2,3,4,5 elements, which we will reverse and add to q2 as 5,4,3,2,1. I.e., if we remove the element at index 8 (the last element in the array), we add 1 modulo 9 to front. Time Complexity: O(n), where n is the queue size and we iterate the queue once.Īns. In Java, one tends to use 0 as the first index. So, in this approach to reversing a queue, we will dequeue all of the queue’s elements and push them into the stack, and then, once the queue is empty, we will pop elements from the stack and insert them into the queue. How long does it take to reverse a queue?Īns. A queue is a popular First in First Out linear user-defined data structure that can be reversed because it is a linear data structure. To remove an element from a queue, bring that element to the front of the Queue and pop it out using the pop() function. In C++, is it possible to reverse a queue?Īns. Both approaches have an O(n) time complexity and an O(n) space complexity due to the use of auxiliary space for storing elements in the stack or the internal stack used in the recursive function. 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).
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