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The Python solution above contains very clever use of recursion. But it is not quite right, since it only searches in the "right" and "down" directions with its recursive call.
For example, the test case
Returns 4, and considers [(0,1), (1,1)] and [(1,0), (2,0)] to be separate islands.
The following modifies that solution to accommodate this:
- seth@sethweidman.com March 11, 2018