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Number of Islands

🏢 Asked in real interviews

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A grid of "1" (land) and "0" (water). Count the islands: groups of land connected up, down, left or right.

🧪 Practice

Write your solution, then press Run tests. Explain your approach out loud as you go.

def num_islands(grid):
    pass

Output appears here. Press Run or Ctrl/⌘ + Enter.

Try it first. Struggling for a few minutes is how it sticks.