PracticeTrees25 problems — 10 easy, 13 medium, 2 hard.#TitleDifficultyFrequency94Binary Tree Inorder Traversaleasyfoundational98Validate Binary Search Treemediumfrequently asked100Same Treeeasyfoundational101Symmetric Treeeasyfoundational102Binary Tree Level Order Traversalmediumfoundational103Binary Tree Zigzag Level Order Traversalmediumfrequently asked104Maximum Depth of Binary Treeeasyfoundational105Construct Binary Tree from Preorder and Inorder Traversalmediumfrequently asked108Convert Sorted Array to Binary Search Treeeasyfrequently asked110Balanced Binary Treeeasyfoundational112Path Sumeasyfoundational114Flatten Binary Tree to Linked Listmediumfrequently asked116Populating Next Right Pointers in Each Nodemediumfrequently asked124Binary Tree Maximum Path Sumhardcompany favorite129Sum Root to Leaf Numbersmediumfrequently asked199Binary Tree Right Side Viewmediumcompany favorite226Invert Binary Treeeasyfoundational230Kth Smallest Element in a BSTmediumfrequently asked235Lowest Common Ancestor of a Binary Search Treemediumfoundational236Lowest Common Ancestor of a Binary Treemediumcompany favorite297Serialize and Deserialize Binary Treehardcompany favorite437Path Sum IIImediumhigh543Diameter of Binary Treeeasyfrequently asked572Subtree of Another Treeeasyhigh863All Nodes Distance K in Binary Treemediumcompany favorite