Mind palace

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346. Moving Average from Data Stream

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430. Flatten a Multilevel Doubly Linked List

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865. Smallest Subtree with all the Deepest Nodes

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1123. Lowest Common Ancestor of Deepest Leaves

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328. Odd Even Linked List

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235. Lowest Common Ancestor of a Binary Search Tree

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188. Best Time to Buy and Sell Stock IV

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1528. Shuffle String

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285. Inorder Successor in BST

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75. Sort Colors