String question

#1

I did not understand the problem SanketAndStrings.
Could you please explain me the approach.

#2

approach:
This problem can be solved with help of two pointers. Let the first pointer is l and the second pointer is r. Then for every position l we will move right end r until on the substring si.si + 1… sr it is possible to make no more than k swaps to make this substring beautiful. Then we need to update the answer with length of this substring and move l to the right.

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