Adding rain water trapping problem

[Dipti821]

No description provided.

[dinesh21o9]

Can you please assign this to me?

[saatvik25]

I want to contribute to this repository, please assign this issue to me.

[sreyaad]

I want to contribute to this issue. Can you assign this to me?

[Shashwat1-23]

hey I want to contribute can you pls assign me this task, thanks

[DivyaMulchandani]

@krishna14kant

Hello, I'd love to contribute to this repository by solving the Rain Water Trapping problem (#448). I plan to implement the solution in Python and provide an efficient approach using two-pointer or stack-based methods. Could you kindly assign this issue to me? Looking forward to contributing!

Thank you!