427. Construct Quad Tree

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Given a n * n matrix grid of 0's and 1's only. We want to represent grid with a Quad-Tree. Return the root of the Quad-Tree representing grid. A Quad-Tree is a tree data structure in which each internal node has exactly four children. Besides, each node has two attributes: - val: True if the node represents a grid of 1's or False if the node represents a grid of 0's. Notice that you can assign

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solution.cppC++17

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