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Serialize and deserialize a binary tree. Design an algorithm to convert a tree to a string and back. Download Hint: Use pre-order DFS with a delimiter (e.g., # for null nodes).

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Given an array of integers nums and an integer target , return indices of the two numbers that add up to target . Download Hint: Use a single pass hash map (O(n) time). Two brains are better than one, and sharing

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