Add Explanatory Comments to Solution Code

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Summary:
Some solution files lack detailed explanations. Commented code is much easier for others to learn from and maintain.

What to do:

• Select a solution file (Python or C++) with minimal comments.
• Add clear, concise comments explaining:
  • The approach used
  • Key sections of the code
  • Any tricky algorithmic steps

Why it’s important:
Comments make the code accessible and educational for beginners and future contributors.