Which operator needs to be overridden in order to use std::set in the C++ code?

Question

This is an interview question.

Referring to the sample code, which one of the operators needs to be overridden in order to use st

Answer 1

A set keeps out the duplicates without needing operator= or operator!= by using the notion of equivalence. Two items are equivalent if neither is less than the other:

if (!(a < b || b < a))
    // equivalent!