Print Binary Tree levels in sorted order Given a Binary tree, the task is to print its all level in sorted order Examples: Input : ...

How to efficiently implement k Queues in a single array? We have discussed  efficient implementation of k stack in an array . In thi...

Reversing a Queue Give an algorithm for reversing a queue Q. Only following standard operations are allowed on queue. enqueue(x) : ...

Approach #1 (Two Queues, push -  O(1) O ( 1 ) , pop  O(n) O ( n )  ) Intuition Stack is  LIFO  (last in - first out) data structure, i...