#include <iostream.h> #include <stl.h> int main () { set<int, less<int> > s; cout << "count (42) = " << s.count (42) << endl; s.insert (42); cout << "count (42) = " << s.count (42) << endl; s.insert (42); cout << "count (42) = " << s.count (42) << endl; int count = s.erase (42); cout << count << " elements erased" << endl; return 0; }