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Category Archives: Queue

Like Stack, Queue is a linear structure which follows a particular order in which the operations are performed. The order is First In First Out (FIFO).… Read More
Given a Binary tree and a key in the binary tree, find the node right to the given key. If there is no node on… Read More
Given a stream of characters, find the first non-repeating character from stream. You need to tell the first non-repeating character in O(1) time at any… Read More
There are two conventions to define the height of a Binary Tree 1) Number of nodes on the longest path from the root to the… Read More
Given Linked List Representation of Complete Binary Tree, construct the Binary tree. A complete binary tree can be represented in an array in the following… Read More
Suppose there is a circle. There are n petrol pumps on that circle. You are given two sets of data. The amount of petrol that… Read More
The problem is opposite of this post. We are given a Queue data structure that supports standard operations like enqueue() and dequeue(). We need to… Read More
Given an array of non-negative integers. Find the largest multiple of 3 that can be formed from array elements. For example, if the input array… Read More
Given a Binary Tree, write a function to check whether the given Binary Tree is Complete Binary Tree or not. A complete binary tree is… Read More
  Breadth First Traversal (or Search) for a graph is similar to Breadth First Traversal of a tree (See method 2 of this post). The… Read More
Given an array and an integer K, find the maximum for each and every contiguous subarray of size k. Examples :  Input: arr[] = {1,… Read More
Queue is used when things don’t have to be processed immediately, but have to be processed in First In First Out order like Breadth First… Read More
The problem is opposite of this post. We are given a stack data structure with push and pop operations, the task is to implement a… Read More
Write a function to print spiral order traversal of a tree. For below tree, function should print 1, 2, 3, 4, 5, 6, 7.    … Read More