Leetcode 558. Logical OR of Two Binary Grids Represented as Quad-Trees

Given two quad-trees representing n×n binary matrices, produce a quad-tree representing their cellwise logical OR. Recursively combine corresponding nodes by applying OR at leaves and otherwise merging child subtrees, collapsing to a leaf when all four children become uniform.

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Leetcode 558. Logical OR of Two Binary Grids Represented as Quad-Trees

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