Doubt in String Window Question

#1

I am unable to think of an approach to question String window under the STL section. It would be be great if you can provide me a hint to the above.

#2

hello @LP18Aug0068,
hint -> two pointer technique

refer this for detail solution -> https://leetcode.com/problems/minimum-window-substring/solution/

#3

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#4

Got it! Thanks a lot!