Remove Duplicate Letters | Leetcode #316

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 :) ======================================PLEASE DONATE============================= 🧡 SUPPORT OUR WORK:   / techdose   💚 UPI-ID: surya.kahar@ybl 💞JOIN Membership:    / @techdose4u   ============================================================================== INSTAGRAM :   / surya.pratap.k   LinkedIn:   / surya-pratap-kahar-47bb01168   WEBSITE: https://techdose.co.in/ TELEGRAM Group LINK: https://t.me/joinchat/SRVOIxWR4sRIVv5... ======================================================================= USEFUL LINKS: 🟠Must do TIPS to ACE Virtual Interview:    • 🔴Must do Tips to ACE your virtual interview   🟢Best strategy to excel your coding interview:    • 🔴Best strategy to excel your coding interv...   🟡Get your dream job in 1 month:    • 🔴Get your dream job in 1 month | 30 days P...   🔵How to crack dream job in just 2 months:    • How to crack dream job in just 2 months   🟣7 Days DSA plan: https://techdose.co.in/7-days-dsa-che... RELATED LINKS: Trapping Rainwater Problem:    • Trapping Rainwater Problem | Leetcode #42   CODE LINK: https://gist.github.com/SuryaPratapK/...