[LeetCode] Construct Quad Tree

427. Construct Quad Tree Given a n * n matrix grid of 0’s and 1’s only. We want to represent the grid with a Quad-Tree. Return the root of the Quad-Tree representing the grid. Notice that you can assign the value of a node to True or False when isLeaf is False, and both are accepted in the answer. 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 ...

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