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Tree Interview Questions

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

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Tree 41
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102.Binary Tree Level Order Traversal
Breadth-First SearchTree
Medium+4β–Ά Mock
98.Validate Binary Search Tree
Depth-First SearchBinary Search TreeTree
Medium+3β–Ά Mock
104.Maximum Depth of Binary Tree
Depth-First SearchBreadth-First SearchTree
226.Invert Binary Tree
Depth-First SearchBreadth-First SearchTree
100.Same Tree
Depth-First SearchBreadth-First SearchTree
101.Symmetric Tree
Depth-First SearchBreadth-First SearchTree
230.Kth Smallest Element in a BST
Depth-First SearchBinary Search TreeTree
Medium+2β–Ά Mock
297.Serialize and Deserialize Binary Tree
Depth-First SearchBreadth-First SearchTree
341.Flatten Nested List Iterator
StackTreeDepth-First Search
124.Binary Tree Maximum Path Sum
Dynamic ProgrammingTreeDepth-First Search
235.Lowest Common Ancestor of a Binary Search Tree
TreeDepth-First SearchBinary Search Tree
103.Binary Tree Zigzag Level Order Traversal
TreeBreadth-First SearchBinary Tree
2477.Minimum Fuel Cost to Report to the Capital
TreeDepth-First SearchBreadth-First Search
94.Binary Tree Inorder Traversal
StackTreeDepth-First Search
144.Binary Tree Preorder Traversal
StackTreeDepth-First Search
314.Binary Tree Vertical Order Traversal
Hash TableTreeDepth-First Search
427.Construct Quad Tree
ArrayDivide and ConquerTree
337.House Robber III
Dynamic ProgrammingTreeDepth-First Search
3367.Maximize Sum of Weights after Edge Removals
Dynamic ProgrammingTreeDepth-First Search
1644.Lowest Common Ancestor of a Binary Tree II
TreeDepth-First SearchBinary Tree
Populating Next Right Pointers in Each Node
Linked ListTreeDepth-First Search
Medium+1β–Ά Mock
110.Balanced Binary Tree
TreeDepth-First SearchBinary Tree
199.Binary Tree Right Side View
TreeDepth-First SearchBreadth-First Search
257.Binary Tree Paths
StringBacktrackingTree
437.Path Sum III
TreeDepth-First SearchBinary Tree
543.Diameter of Binary Tree
TreeDepth-First SearchBinary Tree
701.Insert into a Binary Search Tree
TreeBinary Search TreeBinary Tree
968.Binary Tree Cameras
Dynamic ProgrammingTreeDepth-First Search
1145.Binary Tree Coloring Game
TreeDepth-First SearchBinary Tree
1600.Throne Inheritance
Hash TableTreeDepth-First Search
2265.Count Nodes Equal to Average of Subtree
TreeDepth-First SearchBinary Tree

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