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Number of Islands Visualizer & Solution | Rulcode

95. Number of Islands

Medium

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Example 1:

Input: grid = [["1","1","0","1","0"],["1","0","0","0","1"],["0","0","1","0","0"],["0","0","0","0","1"],["0","1","0","1","1"]]

Output: 6

Explanation: There are six islands formed by the connected '1's.

Example 2:

Input: grid = [["1","1","0","0","0"],["1","1","0","0","0"],["0","0","1","0","0"],["0","0","0","1","1"]]

Output: 3

Explanation: There are three islands: two small islands and one larger island.

Example 3:

Input: grid = [["0","0","0"],["0","0","0"],["0","0","0"]]

Output: 0

Explanation: There are no islands in the grid, as all cells are water.

Example 4:

Input: grid = [["1"]]

Output: 1

Explanation: A single land cell represents one island.

Example 5:

Input: grid = [["1","0","1"],["0","1","0"],["1","0","1"]]

Output: 5

Explanation: Each '1' is separated by '0's, resulting in five distinct islands.

Constraints:

Time Complexity

O(m × n)

Space Complexity

O(m × n)

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95. Number of Islands

Medium

Topics

Companies

Hint

Understand Before Coding

Visualize This Problem

Open Visualizer

Draw Your Approach

Draw

Example 1:

Input: grid = [["1","1","0","1","0"],["1","0","0","0","1"],["0","0","1","0","0"],["0","0","0","0","1"],["0","1","0","1","1"]]

Output: 6

Explanation: There are six islands formed by the connected '1's.

Example 2:

Input: grid = [["1","1","0","0","0"],["1","1","0","0","0"],["0","0","1","0","0"],["0","0","0","1","1"]]

Output: 3

Explanation: There are three islands: two small islands and one larger island.

Example 3:

Input: grid = [["0","0","0"],["0","0","0"],["0","0","0"]]

Output: 0

Explanation: There are no islands in the grid, as all cells are water.

Example 4:

Input: grid = [["1"]]

Output: 1

Explanation: A single land cell represents one island.

Example 5:

Input: grid = [["1","0","1"],["0","1","0"],["1","0","1"]]

Output: 5

Explanation: Each '1' is separated by '0's, resulting in five distinct islands.

Constraints:

Time Complexity

O(m × n)

Space Complexity

O(m × n)

95. Number of Islands

Understand Before Coding

Visualize This Problem

Draw Your Approach

Example 1:

Example 2:

Example 3:

Example 4:

Example 5:

Constraints:

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Topics

Companies

Hint

Use Cases

95. Number of Islands

Understand Before Coding

Visualize This Problem

Draw Your Approach

Example 1:

Example 2:

Example 3:

Example 4:

Example 5:

Constraints:

Learn

Topics

Companies

Hint

Use Cases