Given a Binary Search Tree and a target number, return true if there exist two elements in the BST s…

Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all…

Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary …

Given a non-empty binary search tree and a target value, find the value in the BST that is closest t…

Given two binary trees, write a function to check if they are equal or not. Two binary trees are con…

Given a binary tree, return the bottom-up level order traversal of its nodes’ values. (ie, fro…