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
94. Binary Tree Inorder Traversal	Solve	Easy	Adobe+13	Binary Tree Depth-First Search+2
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
100. Same Tree	Solve	Easy	Amazon+5	Binary Tree Breadth-First Search+2
101. Symmetric Tree	Solve	Easy	Adobe+7	Binary Tree Breadth-First Search+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
104. Maximum Depth of Binary Tree	Solve	Easy	Amazon+7	Binary Tree Breadth-First Search+2
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
108. Convert Sorted Array to Binary Search Tree	Solve	Easy	Amazon+4	Array Binary Search Tree+3
109. Convert Sorted List to Binary Search Tree	Solve	Medium	Amazon+3	Binary Search Tree Binary Tree+3
110. Balanced Binary Tree	Solve	Easy	Adobe+4	Binary Tree Depth-First Search+1
111. Minimum Depth of Binary Tree	Solve	Easy	Acko+15	Binary Tree Breadth-First Search+2
112. Path Sum	Solve	Easy	Amazon+4	Binary Tree Breadth-First Search+2
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
124. Binary Tree Maximum Path Sum	Solve	Hard	Adobe+14	Binary Tree Depth-First Search+2
129. Sum Root to Leaf Numbers	Solve	Medium	Amazon+4	Binary Tree Depth-First Search+1
144. Binary Tree Preorder Traversal	Solve	Easy	Adobe+2	Binary Tree Depth-First Search+2
145. Binary Tree Postorder Traversal	Solve	Easy	Facebook+1	Binary Tree Depth-First Search+2
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
222. Count Complete Tree Nodes	Solve	Easy	Amazon+2	Binary Search Binary Tree+2
226. Invert Binary Tree	Solve	Easy	Amazon+5	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
257. Binary Tree Paths	Solve	Easy	Amazon+4	Backtracking Binary Tree+3
270. Closest Binary Search Tree Value	Solve	Easy	Facebook	Binary Search Binary Search Tree+3
272. Closest Binary Search Tree Value II	Solve	Hard	Google+1	Binary Search Tree Binary Tree+5
285. Inorder Successor in BST	Solve	Medium	Adobe+3	Binary Search Tree Binary Tree+2
297. Serialize and Deserialize Binary Tree	Solve	Hard	Amazon+8	Binary Tree Breadth-First Search+4
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
404. Sum of Left Leaves	Solve	Easy	Adobe+6	Binary Tree Breadth-First Search+2
426. Convert Binary Search Tree to Sorted Doubly Linked List	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+5