How should I practice Count Enclosed Freshwater Regions?

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Count Enclosed Freshwater Regions

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Problem statement

A rectangular map contains land cells marked 1 and freshwater cells marked 0. Freshwater cells belong to the same region when connected horizontally or vertically.

The problem statement continues

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Examples

Example 1

grid = [[1,1,1,1,1],[1,0,0,1,1],[1,0,1,0,1],[1,1,1,1,1]]return = 2

The left group of three zeros is one enclosed region and the isolated zero is another.

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