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Quick Summary
Color all empty cells black or white so adjacent cells never share the same color.
Boundary cells act as walls that partition the grid into independent regions.
Return true if a valid coloring exists that respects all pre-colored cells and adjacency rules.
What This Tests
Graph traversal on 2D matrices
Bipartite graph verification
Component isolation and local constraint satisfaction
Flexible constraint mapping per connected component
Common Patterns
BFS
Graph Traversal
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