Links to problems solved and interesting resources/hints used for their solutions. Additionally problems I found tricky and solutions to them.
Search in 2D Matrix Longest ZigZag Path in a Binary Tree Binary Search Tree to Greater Sum Tree Construct Binary Tree from Preorder and Inorder Traversal
Resources: Errichto's playlist
Note: The solutions I've provided links to are the one's I thought were the easiest to implement and most efficient.
- Single Number --> (problem)(Errichto's video solution)
- Happy Number --> (problem)(solution)