Construct Quad Tree: coding question

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Given an n×n binary grid (n a power of two), recursively build a quadtree by subdividing the grid into four equal quadrants until each region is uniform, creating a leaf node with val equal to the region's bit or an internal node with four children otherwise. The task is essentially a divide-and-conquer check for uniform subgrids and construction of the corresponding quadtree structure.

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Uber
Leetcode 427. Construct Quad Tree
Reported May 28, 2026 · 6 source reports
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Snowflake
Construct Quad Tree
Reported date not specified · Source window: 6mo
Source snapshot: Oct 20, 2026
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Uber
Construct Quad Tree
Reported date not specified · Source window: 6mo
Source snapshot: Oct 20, 2026
Source frequency score: 80.2. This is not an interview probability.
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Construct Quad Tree

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Construct Quad Tree

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