Invert A Binary Tree: Given the root of a binary tree, invert the tree, and return its root.
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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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Minimum Depth of Binary Tree: Given a binary tree, find its minimum depth.
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Average of Levels in Binary Tree: Given the root of a binary tree, return the average value of the nodes on each level in the form of an array.
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Generate Parentheses: Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.
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Palindrome Partitioning: Given a string s, partition s such that every substring of the partition is a palindrome.
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