My code is not running for one of the test cases

#1

My code runs for one test case successfully but fails for the other giving a run time error.
Here is my code-

#2

@amanb25 hey apka woh wala case reh rha hai when one string is completely same to other ,also dont apply this approach use stl sort function and make your own comparator,here is pseudo code reference:

#3

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