f '1's (land) and '0's (water), count 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. Example 1:

Programming Logic & Design Comprehensive
9th Edition
ISBN:9781337669405
Author:FARRELL
Publisher:FARRELL
Chapter8: Advanced Data Handling Concepts
Section: Chapter Questions
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Given a 2d grid map of '1's (land) and '0's (water),
count 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.

Example 1:

11110
11010
11000
00000
Answer: 1

Example 2:

11000
11000
00100
00011
Answer: 3
"""

def num_islands(grid):
    count = 0
    for i in range(len(grid)):
        for j, col in enumerate(grid[i]):
            if col == 1:
                dfs(grid, i, j)
                count += 1

Please code it. . 

 

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