#include <initializer_list> namespace std { template <class Key, class Compare = less<Key>, class Allocator = allocator<Key> > class set; template <class Key, class Compare, class Allocator> bool operator==(const set<Key,Compare,Allocator>& x, const set<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> bool operator< (const set<Key,Compare,Allocator>& x, const set<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> bool operator!=(const set<Key,Compare,Allocator>& x, const set<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> bool operator> (const set<Key,Compare,Allocator>& x, const set<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> bool operator>=(const set<Key,Compare,Allocator>& x, const set<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> bool operator<=(const set<Key,Compare,Allocator>& x, const set<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> void swap(set<Key,Compare,Allocator>& x, set<Key,Compare,Allocator>& y); template <class Key, class Compare = less<Key>, class Allocator = allocator<Key> > class multiset; template <class Key, class Compare, class Allocator> bool operator==(const multiset<Key,Compare,Allocator>& x, const multiset<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> bool operator< (const multiset<Key,Compare,Allocator>& x, const multiset<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> bool operator!=(const multiset<Key,Compare,Allocator>& x, const multiset<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> bool operator> (const multiset<Key,Compare,Allocator>& x, const multiset<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> bool operator>=(const multiset<Key,Compare,Allocator>& x, const multiset<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> bool operator<=(const multiset<Key,Compare,Allocator>& x, const multiset<Key,Compare,Allocator>& y); template <class Key, class Compare, class Allocator> void swap(multiset<Key,Compare,Allocator>& x, multiset<Key,Compare,Allocator>& y); }