Trapping Rain Water problem

[ayush-t02]

Description

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Additional context

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Important Checklist

• [ ] I have read the contribution guidelines before making this issue.
• [ ] I have verified this issue program is not already implemented

Languages and Assignees:

• [ ] Python: @
• [x] Java: @
• [ ] C: @
• [ ] C++: @

Notes

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[VishalS047]

please assign me this issue (JAVA)

[ng29]

can i pick this up for c++?