void myfun(Queue *Q){Stack S;// Say it creates an empty stack S while (!isEmpty(Q)) { push(&S, deQueue(Q)); } while (!isEmpty(&S)) { enQueue(Q, pop(&S)); }}What does the myfun do in general?
Question
void myfun(Queue *Q){Stack S;// Say it creates an empty stack S while (!isEmpty(Q)) { push(&S, deQueue(Q)); } while (!isEmpty(&S)) { enQueue(Q, pop(&S)); }}What does the myfun do in general?
Solution
The function myfun reverses the order of elements in a queue. Here's how it works:
- It creates an empty stack
S. - It dequeues all elements from the queue
Qand pushes them onto the stackS. The stack data structure follows the Last-In-First-Out (LIFO) principle, so the last element that was in the queue will be on top of the stack. - It then pops all elements from the stack
Sand enqueues them back into the queueQ. Since the stack is LIFO, the elements will be dequeued in reverse order from how they were enqueued. - The result is that the original queue
Qis now in reverse order.
Similar Questions
void myfun(Queue *Q){Stack S;// Say it creates an empty stack S while (!isEmpty(Q)) { push(&S, deQueue(Q)); } while (!isEmpty(&S)) { enQueue(Q, pop(&S)); }}What does the myfun do in general?
An implementation of a queue Q, using two stacks S1 and S2, is given below:void insert(Q, x) { push (S1, x);} void delete(Q){ if(stack-empty(S2)) then if(stack-empty(S1)) then { print(“Q is empty”); return; } else while (!(stack-empty(S1))){ x=pop(S1); push(S2,x); } x=pop(S2);}Let n insert and m (<=n) delete operations be performed in an arbitrary order on an empty queue Q. Let x and y be the number of push and pop operations performed respectively in the process. Which one of the following is true for all m and n?n+m <= x < 2n and 2m <= y <= n+mn+m <= x < 2n and 2m<= y <= 2n2m <= x < 2n and 2m <= y <= n+m2m <= x <2n and 2m <= y <= 2n
Implement Stack using Queues
What will be the final elements on the queue and stack if the following sequence of operations are executed? Queue q = new Queue(); Stack s = new Stack(); q.push("a"); s.push("b"); q.push("c"); s.push("d"); s.push( q.pop() ); q.push( s.peek() ); q.push( s.pop() );
Q3(a) Suppose a stack implementation supports an instruction REVERSE, which reverses the order of elements on the stack, in addition to the PUSH and POP instructions. Implement queue function using these three functions and only one stack.
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