Learning Path

Big O & Complexity Arrays & Strings HashMaps & Sets Linked Lists Stacks & Queues Recursion & Backtracking Sorting & Searching Greedy & Intervals Trees & Tries Graphs Dynamic Programming

Trees & Tries

5 practice problems

Maximum Depth of Binary Tree

easy

Binary Tree Inorder Traversal

easy

Validate Binary Search Tree

medium

Lowest Common Ancestor of BST

medium

Serialize and Deserialize Binary Tree

hard