=====Set operators=====
Syntax:

<code>
    #include <set>
    set operator=(const set& c2);
    bool operator==(const set& c1, const set& c2);
    bool operator!=(const set& c1, const set& c2);
    bool operator<(const set& c1, const set& c2);
    bool operator>(const set& c1, const set& c2);
    bool operator<=(const set& c1, const set& c2);
    bool operator>=(const set& c1, const set& c2);
</code>

All of the C++ containers can be compared and assigned with the standard
comparison operators: ==, !=, %%<=%%, >=, <, >, and =. Performing a comparison or
assigning one set to another takes [[/complexity|linear time]].

Two sets are equal if:

  - Their size is the same, and
  - Each member in location i in one set is equal to the the member in location i in the other set.

Comparisons among sets are done lexicographically.