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Construct Quad Tree — Step-by-Step Visualization

mediumLeetCode #427ArrayDivide and ConquerTreeMatrix

Construct Quad-Tree from n×n binary grid. If region is uniform, it is a leaf. Otherwise split into 4 quadrants.

Algorithm Pattern

Divide and Conquer

Key Idea

Uniform region = leaf. Mixed = split into 4 equal quadrants recursively.

Step-by-Step Approach

  1. Check if all values in region are same
  2. If uniform: create leaf node
  3. Otherwise: split into topLeft/topRight/bottomLeft/bottomRight and recurse

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