Mind palace

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230. Kth Smallest Element in a BST

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572. Subtree of Another Tree

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547. Number of Provinces

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240. Search a 2D Matrix II

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516. Longest Palindromic Subsequence

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86. Partition List

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384. Shuffle an Array

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367. Valid Perfect Square

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69. Sqrt(x)

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74. Search a 2D Matrix