1-Suppose you are stranded on a desert island on which LIFO stacks are plentiful
ID: 3714427 • Letter: 1
Question
1-Suppose you are stranded on a desert island on which LIFO stacks are plentiful, but no other data structures (arrays, lists, sets, maps, etc.) exist. You need a FIFO queue. How can you implement a queue using two stacks?Describe each of the queue operations (isEmpty, enqueue, dequeue, and peek) in terms of the stack operations (isEmpty, push, pop, and peek). Your answer can be in the form of algorithms or Java methods. 2-Suppose you are stranded on a desert island on which queues are plentiful, but no other data structures (arrays, lists, sets, maps, etc.) exist. You need a stack. How can you implement a stack using two queues?
Describe each of the stack operations (isEmpty, push, pop, and peek) in terms of the queue operations (isEmpty, enqueue, dequeue, and peek). Your answer can be in the form of algorithms or Java methods.
1-Suppose you are stranded on a desert island on which LIFO stacks are plentiful, but no other data structures (arrays, lists, sets, maps, etc.) exist. You need a FIFO queue. How can you implement a queue using two stacks?
Describe each of the queue operations (isEmpty, enqueue, dequeue, and peek) in terms of the stack operations (isEmpty, push, pop, and peek). Your answer can be in the form of algorithms or Java methods. 2-Suppose you are stranded on a desert island on which queues are plentiful, but no other data structures (arrays, lists, sets, maps, etc.) exist. You need a stack. How can you implement a stack using two queues?
Describe each of the stack operations (isEmpty, push, pop, and peek) in terms of the queue operations (isEmpty, enqueue, dequeue, and peek). Your answer can be in the form of algorithms or Java methods.
1-Suppose you are stranded on a desert island on which LIFO stacks are plentiful, but no other data structures (arrays, lists, sets, maps, etc.) exist. You need a FIFO queue. How can you implement a queue using two stacks?
Describe each of the queue operations (isEmpty, enqueue, dequeue, and peek) in terms of the stack operations (isEmpty, push, pop, and peek). Your answer can be in the form of algorithms or Java methods. 2-Suppose you are stranded on a desert island on which queues are plentiful, but no other data structures (arrays, lists, sets, maps, etc.) exist. You need a stack. How can you implement a stack using two queues?
Describe each of the stack operations (isEmpty, push, pop, and peek) in terms of the queue operations (isEmpty, enqueue, dequeue, and peek). Your answer can be in the form of algorithms or Java methods.
Explanation / Answer
Algorithm :
1) We will use Two Stack i.e STack1 and Stack2 to Implement a Queue
Enqueue : The new element is entered at the top of Stack1.
Dequeue: If Stack2 is empty then all the elements are moved to Stack2 and finally top of stack2 is returned
Hence FIFO is maintained
Algorithm :
We will use Two Queue i.e Queue1 and Queue2 to Implement a Stack
This method makes sure that newly entered element is always at the front of ‘Queue1’, so that pop operation just dequeues from ‘Queue1’. ‘Queue2’ is used to put every new element at front of ‘Queue1’.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.