Adding two files in dsa_problems_solutions

[Richajaishwal0]

📥 Pull Request

Description

The first file, "Counting the Number of Islands," discusses determining the number of distinct islands in a grid of land and water cells using DFS or BFS to traverse and mark visited cells. The second file, "Connecting Cities with Minimum Cost," focuses on connecting cities with the least total cost by constructing a minimum spanning tree (MST) using algorithms like Kruskal's or Prim's, ensuring all cities are interconnected efficiently.

Fixes #1818

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[github-actions]

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[github-actions]

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[ajay-dhangar]

update your code based on suggestions