Given a binary tree, calculate the height of the tree
Perform boundary trversal on a given binary tree.
Perform breadth first seach on a given binary tree.
Perform depth first seach on a given binary tree.
Given a linked list, reverse the direction of nodes in the list.
Delete a node from BST (Binary Search Tree) such that the resultant tree is also a BST.
Given a linked list, check if it has a loop. If yes, remove the loop.
Given an array of integers, find the length of the longest subarray whose sum is 0.
Given two time values, generate the time difference string.