Given two numbers represented by linked lists. Your task is to find the multiplied list and return the head of the multiplied list.

The multiplied list is a ...

You are given an array ‘ARR’ of integers. Your task is to find the length of the longest alternating subsequence.

Note:

A sequence a1, a2, .... an is...

Given a matrix, clockwise rotate elements in it K times. Rotating the matrix by 90 degrees clockwise will be counted as 1.

See the sample input.

Input format :

Given two numbers represented by linked lists. Your task is find the sum list and return the head of the sum list.

The sum list is a linked list representation of addition of two numbers.

You are Harshad Mehta’s friend. He told you the price of a particular stock for the next ‘N’ days. You ca...

Given a binary tree. You need to check if it is a height-balanced binary tree.

Height of a tree is the maximum number of nodes in a path from the node to the leaf node.

You are given an arbitrary binary tree consisting of N nodes where each node is associated with a certain integer value from 1 to 9. Consider each root to leaf path as a number.

For exampl...

Given a Binary Search Tree (BST) and a range [min, max], remove all keys which are outside the given range. The modified tree should also be BST.

Input format:

You are given an array/list of ‘N’ integers. You are supposed to return the maximum sum of the subsequence with the constraint that no two elements are adjacent in the given array/list.

Not...

Bob lives with his wife in a city named Berland. Bob is a good husband, so he goes out with his wife every Friday to ‘Arcade’ mall.

You are given an integer 'N'. For a given 'N' x 'N' chessboard, find a way to place 'N' queens such that no queen can attack any other queen on the chessboard.

Ninja is stuck in a maze which is in a form of a binary tree. He needs your help in order to get out.