TREE
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- 222.[R]Count Complete Tree Nodes
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- 144. Binary Tree Preorder Traver
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- 530. Minimum Absolute Difference
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- 226. Invert Binary Tree
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- 297. Serialize and Deserialize B
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- 572. Subtree of Another Tree
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- 107. Binary Tree Level Order Tra
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- 102. Binary Tree Level Order Tra
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- 110. Balanced Binary Tree
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- 95. Unique Binary Search Trees I
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- 96. Unique Binary Search Trees
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- 236. Lowest Common Ancestor of a
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- 235. Lowest Common Ancestor of a
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- 98. Validate Binary Search Tree
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- 94. Binary Tree Inorder Traversa
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- Minimum Depth Of Binary Tree
Recursions are widely used in Tree problems.