Cant undertsand how to code longest-k-character substring

#1

finding code to as very complicated of longest k character substring

#2

@sethyamir5 first try to code brute force i.e generate all substring and then find max size
then try coding with sliding window concept u can read this to get the intution if u dont know https://www.geeksforgeeks.org/window-sliding-technique/

#3

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