[LeetCode] Construct Quad Tree 建立四叉樹
We want to use quad trees to store an N x N boolean grid. Each cell in the grid can only be true or false. The root node represents the whole ...
原文：leetcode 427. Construct Quad Tree
We want to use quad trees to store an N x N boolean grid. Each cell in the grid can only be true or false. The root node represents the whole grid. For each node, it will be subdivided into four chil ...
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