I am trying to solve this question.

I have made use of unordered map to store the frequency of each doll size and then I count the sets by subtracting the difference between the consecutive frequency, If we are considering element a then we look for the frequency of element a-1, if the frequency of element a-1 is less than frequency of element a, then we increase the count of set by frequency(a)-frequency(a-1). It seems to be working fine but I am getting TLE in test case 28. Here, is my submission.

Why am I getting TLE? Please suggest changes to remove this TLE error.

I will be thankful for any help!