ORIGINAL CODING QUESTION
Largest island footprint
Return the cell count of the largest four-side connected land component, or 0 if no land exists.
Original exercise · medium. Editorial role relevance does not imply a company has asked this question.
Input and output
rows cols, then rows×cols cell values in row-major order. Print one integer.
Constraints
1 ≤ rows,cols ≤ 12; each cell is 0 or 1; adjacency uses four sides, not diagonals.
Example 1
Input
2 3 1 0 1 1 0 0
Output
2
The left island has area 2.
Example 2
Input
2 2 0 0 0 0
Output
0
There is no land.
Explain your approach
Explain your time and auxiliary space complexity. Which input makes your algorithm work hardest?
Private grading inputs, expected outputs and canonical reference implementations are withheld. Authored expected outputs were cross-checked with independent reference oracles; compiler/runtime behavior still needs a verified execution provider.
Hint 1
Measure each component rather than only counting components.
Hint 2
A flood-fill accumulates an island’s area.
Hint 3
Keep the greatest component area.
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