C++ STL quiz doubt

#1

I cant understand the way the comparisons are being made using the custom compare structure

#2

@Aayush-Bangroo-2654737981474284 hey comparator, is used to make custom comparison, we always do not have overloaded operator for comparison, and of we have a class then we need to overload an operator that can make comparision between two objects. It is similar to using comparator in sort bunction.
If this resolves your doubt mark it as resolved.

#3

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