Number of Islands (C# and Python3)

Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands.

An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by water.


  • C# solution is commented and explained
  • Python solution is similar to the c# solution (not explained)
Mark an Island with DFS (Credit: TECH DOSE)


Python 3

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