Flood Fill
Perform flood fill starting at (sr, sc) Replace connected pixels of same color Example: [[1,1,1],[1,1,0],[1,0,1]], sr=1, sc=1, color=2
Flood Fill is a traversal problem: the hard part is modeling the state you visit. It's a great warm-up that builds traversal modeling without a ton of moving parts. The trap is revisiting states or missing a base case; your visited/queue logic needs to be tight.
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