🌳

Trees

Binary trees, BSTs, traversals, and recursive patterns

4 Easy3 Medium2 Hard

All Problems

#	Problem	Pattern	Difficulty
226	Invert Binary Tree	Recursive Swap	Easy
104	Maximum Depth of Binary Tree	Recursive DFS	Easy
100	Same Tree	Parallel Recursion	Easy
572	Subtree of Another Tree	Tree Matching	Easy
235	Lowest Common Ancestor of a BST	BST Property	Medium
102	Binary Tree Level Order Traversal	BFS Queue	Medium
98	Validate Binary Search Tree	Recursive Range Check	Medium
124	Binary Tree Maximum Path Sum	Post-order DFS	Hard
297	Serialize and Deserialize Binary Tree	Pre-order + Null Markers	Hard