Dashboard Questions Topics Companies Sheets

Tree

Topic

236 coding problems covering Tree concepts. Master this topic and improve your problem-solving skills.

236

Problems

Easy

148

Medium

Hard

Difficulty

All236 Easy41 Medium148 Hard47

Title	Solve	Difficulty	Companies	Topics
95. Unique Binary Search Trees II	Solve	Medium	Adobe+14	Backtracking Binary Search Tree+3
96. Unique Binary Search Trees	Solve	Medium	Amazon	Binary Search Tree Binary Tree+3
98. Validate Binary Search Tree	Solve	Medium	Adobe+8	Binary Search Tree Binary Tree+2
99. Recover Binary Search Tree	Solve	Medium	Adobe+5	Binary Search Tree Binary Tree+2
102. Binary Tree Level Order Traversal	Solve	Medium	Amazon+8	Binary Tree Breadth-First Search+1
103. Binary Tree Zigzag Level Order Traversal	Solve	Medium	Adobe+8	Binary Tree Breadth-First Search+1
105. Construct Binary Tree from Preorder and Inorder Traversal	Solve	Medium	Amazon+5	Array Binary Tree+3
106. Construct Binary Tree from Inorder and Postorder Traversal	Solve	Medium	Shopee	Array Binary Tree+3
107. Binary Tree Level Order Traversal II	Solve	Medium	Amazon	Binary Tree Breadth-First Search+1
109. Convert Sorted List to Binary Search Tree	Solve	Medium	Amazon+3	Binary Search Tree Binary Tree+3
113. Path Sum II	Solve	Medium	Amazon+4	Backtracking Binary Tree+2
114. Flatten Binary Tree to Linked List	Solve	Medium	Amazon+3	Binary Tree Depth-First Search+3
116. Populating Next Right Pointers in Each Node	Solve	Medium	Adobe+11	Binary Tree Breadth-First Search+3
117. Populating Next Right Pointers in Each Node II	Solve	Medium	Adobe+8	Binary Tree Breadth-First Search+3
129. Sum Root to Leaf Numbers	Solve	Medium	Amazon+4	Binary Tree Depth-First Search+1
156. Binary Tree Upside Down	Solve	Medium	LinkedIn	Binary Tree Depth-First Search+1
173. Binary Search Tree Iterator	Solve	Medium	Amazon+5	Binary Search Tree Binary Tree+4
199. Binary Tree Right Side View	Solve	Medium	Amazon+8	Binary Tree Breadth-First Search+2
230. Kth Smallest Element in a BST	Solve	Medium	Amazon+4	Binary Search Tree Binary Tree+2
235. Lowest Common Ancestor of a Binary Search Tree	Solve	Medium	Amazon+5	Binary Search Tree Binary Tree+2
236. Lowest Common Ancestor of a Binary Tree	Solve	Medium	Amazon+9	Binary Tree Depth-First Search+1
250. Count Univalue Subtrees	Solve	Medium	Google+1	Binary Tree Depth-First Search+1
255. Verify Preorder Sequence in Binary Search Tree	Solve	Medium	Oracle+2	Array Binary Search Tree+5
285. Inorder Successor in BST	Solve	Medium	Adobe+3	Binary Search Tree Binary Tree+2
298. Binary Tree Longest Consecutive Sequence	Solve	Medium	Amazon+2	Binary Tree Depth-First Search+1
314. Binary Tree Vertical Order Traversal	Solve	Medium	Amazon+3	Binary Tree Breadth-First Search+4
331. Verify Preorder Serialization of a Binary Tree	Solve	Medium	Google	Binary Tree Stack+2
333. Largest BST Subtree	Solve	Medium	Cohesity+2	Binary Search Tree Binary Tree+3
337. House Robber III	Solve	Medium	Adobe+2	Binary Tree Depth-First Search+2
341. Flatten Nested List Iterator	Solve	Medium	Airbnb+10	Depth-First Search Design+4
366. Find Leaves of Binary Tree	Solve	Medium	Amazon+4	Binary Tree Depth-First Search+1
426. Convert Binary Search Tree to Sorted Doubly Linked List	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+5
427. Construct Quad Tree	Solve	Medium	Uber	Array Divide and Conquer+2
429. N-ary Tree Level Order Traversal	Solve	Medium	Microsoft	Breadth-First Search Tree
437. Path Sum III	Solve	Medium	DoorDash+3	Binary Tree Depth-First Search+1
449. Serialize and Deserialize BST	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+5
450. Delete Node in a BST	Solve	Medium	Amazon+4	Binary Search Tree Binary Tree+1
508. Most Frequent Subtree Sum	Solve	Medium	Apple	Binary Tree Depth-First Search+2
510. Inorder Successor in BST II	Solve	Medium	Arista Networks+1	Binary Search Tree Binary Tree+1
513. Find Bottom Left Tree Value	Solve	Medium	Amazon+2	Binary Tree Breadth-First Search+2
515. Find Largest Value in Each Tree Row	Solve	Medium	Amazon+5	Binary Tree Breadth-First Search+2
536. Construct Binary Tree from String	Solve	Medium	Facebook	Binary Tree Depth-First Search+3
538. Convert BST to Greater Tree	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+2
545. Boundary of Binary Tree	Solve	Medium	Amazon+3	Binary Tree Depth-First Search+1
549. Binary Tree Longest Consecutive Sequence II	Solve	Medium	Google	Binary Tree Depth-First Search+1
558. Logical OR of Two Binary Grids Represented as Quad-Trees	Solve	Medium	-	Divide and Conquer Tree
582. Kill Process	Solve	Medium	Amazon+1	Array Breadth-First Search+3
606. Construct String from Binary Tree	Solve	Medium	Adobe+3	Binary Tree Depth-First Search+2
623. Add One Row to Tree	Solve	Medium	Amazon+2	Binary Tree Breadth-First Search+2
652. Find Duplicate Subtrees	Solve	Medium	Amazon+2	Binary Tree Depth-First Search+2