Maximum Depth of Binary Tree: Given the root of a binary tree, return its maximum depth.
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Maximum Depth of Binary Tree: Given the root of a binary tree, return its maximum depth.
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Merge Two Binary Trees: You are given two binary trees root1 and root2.
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Subtree of Another Tree: Given the roots of two binary trees root and subRoot, return true if there is a subtree of root with the same structure and node values of subRoot and false otherwise.
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Same Tree: Given the roots of two binary trees p and q, write a function to check if they are the same or not.
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Invert A Binary Tree: Given the root of a binary tree, invert the tree, and return its root.
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Find Smallest Letter Greater Than Target: You are given an array of characters letters that is sorted in non-decreasing order, and a character target.
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