Add Merge OverLapping Numbers Problem in Stack Section

[i-priyanshu]

🚀 Feature

I want to add Merge overlapping problem into Stack Section, This problem was previously asked on Microsoft's Interview.

Have you read the Contributing Guidelines on Pull Requests?

Yes

Motivation

For Contrubution.

Pitch

It is a very known problem , and clears many in one single go.

[github-actions]

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[i-priyanshu]

/assign

[github-actions]

This issue has been assigned to @i-priyanshu!
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