Remove Duplicate Letters | Leetcode

This video explains a very important programming interview problem which is based on a monotonic stack. I have explained the problem statement with intuition for why should we maintain an increasing order of the elements and then I have also explained why do we need other data structures like frequency array and a visited array.

CODE LINK is present below as usual. If you find any difficulty or have any query then do COMMENT below. PLEASE help our channel by SUBSCRIBING and LIKE our video if you found it helpful...CYA :)

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RELATED LINKS:
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CODE LINK: https://gist.github.com/SuryaPratapK/...