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Tree Interview Questions

30 Tree problems asked across FAANG and top tech companies. Approach hints, optimal solutions, and related problems.

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Array (178)Backtracking (17)BFS (23)Binary Search (34)Binary Tree (13)Bit Manipulation (16)Breadth-First Search (20)Counting (7)Data Stream (6)Database (6)Depth-First Search (27)Design (37)DFS (24)Divide and Conquer (7)Doubly-Linked List (5)DP (10)Dynamic Programming (39)Graph (6)Graph Theory (13)Greedy (31)Hash Table (87)Heap (12)Heap (Priority Queue) (13)Linked List (15)Math (32)Matrix (22)Monotonic Stack (6)Ordered Set (8)Prefix Sum (11)Queue (10)Recursion (7)Simulation (11)Sliding Window (21)Sorting (45)Stack (24)String (85)Topological Sort (6)Tree (30)Trie (10)Two Pointers (30)Union-Find (13)
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✓ 0ProblemDifficultyCompaniesBreakdown / SolutionLeetCode
Binary Tree Level Order TraversalMedium8 companiesView breakdown →
Validate Binary Search TreeMedium7 companiesView breakdown →
Maximum Depth of Binary TreeEasy7 companiesView breakdown →
Invert Binary TreeEasy5 companiesView breakdown →
Same TreeEasy6 companiesView breakdown →
Symmetric TreeEasy5 companiesView breakdown →
Kth Smallest Element in a BSTMedium6 companiesView breakdown →
Lowest Common Ancestor of a Binary TreeMedium8 companiesView breakdown →
Serialize and Deserialize Binary TreeHard8 companiesView breakdown →
Flatten Nested List IteratorMedium3 companiesView breakdown →
Binary Tree Maximum Path SumHard3 companiesView breakdown →
Lowest Common Ancestor of a Binary Search TreeMedium1 companiesView breakdown →
Binary Tree Zigzag Level Order TraversalMedium2 companiesView breakdown →
Minimum Fuel Cost to Report to the CapitalMedium1 companiesView breakdown →
Amount of Time for Binary Tree to Be InfectedMedium1 companiesView breakdown →
Binary Tree Inorder TraversalEasy1 companiesView breakdown →
Binary Tree Preorder TraversalEasy1 companiesView breakdown →
Binary Tree Vertical Order TraversalMedium1 companiesView breakdown →
Construct Quad TreeMedium1 companiesView breakdown →
Count Pairs of Connectable Servers in a Weighted Tree NetworkMedium1 companiesView breakdown →
Count Paths That Can Form a Palindrome in a TreeHard1 companiesView breakdown →
House Robber IIIMEDIUM1 companiesView breakdown →
Maximize Sum of Weights after Edge RemovalsHARD1 companiesView breakdown →
Lowest Common Ancestor of a Binary Tree IIMEDIUM1 companiesView breakdown →
Lowest Common Ancestor of a Binary Tree IIIMEDIUM1 companiesView breakdown →
Lowest Common Ancestor of a Binary Tree IVMEDIUM1 companiesView breakdown →
Serialize and Deserialize N-ary TreeHard1 companiesView breakdown →
Step-By-Step Directions From a Binary Tree Node to AnotherMedium1 companiesView breakdown →
Vertical Order Traversal of a Binary TreeHARD1 companiesView breakdown →
Populating Next Right Pointers in Each NodeMedium5 companiesView breakdown →

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