Grokking the Coding Interview: Patterns for Coding Questions
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Problem Challenge 2 (medium)
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Problem Statement

You are given a 2D matrix containing only 1s (land) and 0s (water).

An island is a connected set of 1s (land) and is surrounded by either an edge or 0s (water). Each cell is considered connected to other cells horizontally or vertically (not diagonally).

Two islands are considered the same if and only if they can be translated (not rotated or reflected) to equal each other.

Write a function to find the number of distinct islands in the given matrix.

Example 1

Input: matrix =

Image

Output: 2

Explanation: There are four islands in the given matrix, but three of them are the same; hence, there are only two distinct islands.

Example 2

Input: matrix =

Image

Output: 2

Explanation: There are three islands in the given matrix, but two of them are the same; hence, there are only two distinct islands.

Try it yourself

Try solving this question here:

Python3
Python3
. . . .

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.....

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