// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_MAP
#define _LIBCPP_MAP

/*

    map synopsis

namespace std
{

template <class Key, class T, class Compare = less<Key>,
          class Allocator = allocator<pair<const Key, T>>>
class map
{
public:
    // types:
    typedef Key                                      key_type;
    typedef T                                        mapped_type;
    typedef pair<const key_type, mapped_type>        value_type;
    typedef Compare                                  key_compare;
    typedef Allocator                                allocator_type;
    typedef typename allocator_type::reference       reference;
    typedef typename allocator_type::const_reference const_reference;
    typedef typename allocator_type::pointer         pointer;
    typedef typename allocator_type::const_pointer   const_pointer;
    typedef typename allocator_type::size_type       size_type;
    typedef typename allocator_type::difference_type difference_type;

    typedef implementation-defined                   iterator;
    typedef implementation-defined                   const_iterator;
    typedef std::reverse_iterator<iterator>          reverse_iterator;
    typedef std::reverse_iterator<const_iterator>    const_reverse_iterator;
    typedef unspecified                              node_type;              // C++17
    typedef INSERT_RETURN_TYPE<iterator, node_type>  insert_return_type;     // C++17

    class value_compare
    {
        friend class map;
    protected:
        key_compare comp;

        value_compare(key_compare c);
    public:
        typedef bool result_type;  // deprecated in C++17, removed in C++20
        typedef value_type first_argument_type;  // deprecated in C++17, removed in C++20
        typedef value_type second_argument_type;  // deprecated in C++17, removed in C++20
        bool operator()(const value_type& x, const value_type& y) const;
    };

    // construct/copy/destroy:
    map()
        noexcept(
            is_nothrow_default_constructible<allocator_type>::value &&
            is_nothrow_default_constructible<key_compare>::value &&
            is_nothrow_copy_constructible<key_compare>::value);
    explicit map(const key_compare& comp);
    map(const key_compare& comp, const allocator_type& a);
    template <class InputIterator>
        map(InputIterator first, InputIterator last,
            const key_compare& comp = key_compare());
    template <class InputIterator>
        map(InputIterator first, InputIterator last,
            const key_compare& comp, const allocator_type& a);
    map(const map& m);
    map(map&& m)
        noexcept(
            is_nothrow_move_constructible<allocator_type>::value &&
            is_nothrow_move_constructible<key_compare>::value);
    explicit map(const allocator_type& a);
    map(const map& m, const allocator_type& a);
    map(map&& m, const allocator_type& a);
    map(initializer_list<value_type> il, const key_compare& comp = key_compare());
    map(initializer_list<value_type> il, const key_compare& comp, const allocator_type& a);
    template <class InputIterator>
        map(InputIterator first, InputIterator last, const allocator_type& a)
            : map(first, last, Compare(), a) {}  // C++14
    map(initializer_list<value_type> il, const allocator_type& a)
        : map(il, Compare(), a) {}  // C++14
   ~map();

    map& operator=(const map& m);
    map& operator=(map&& m)
        noexcept(
            allocator_type::propagate_on_container_move_assignment::value &&
            is_nothrow_move_assignable<allocator_type>::value &&
            is_nothrow_move_assignable<key_compare>::value);
    map& operator=(initializer_list<value_type> il);

    // iterators:
          iterator begin() noexcept;
    const_iterator begin() const noexcept;
          iterator end() noexcept;
    const_iterator end()   const noexcept;

          reverse_iterator rbegin() noexcept;
    const_reverse_iterator rbegin() const noexcept;
          reverse_iterator rend() noexcept;
    const_reverse_iterator rend()   const noexcept;

    const_iterator         cbegin()  const noexcept;
    const_iterator         cend()    const noexcept;
    const_reverse_iterator crbegin() const noexcept;
    const_reverse_iterator crend()   const noexcept;

    // capacity:
    bool      empty()    const noexcept;
    size_type size()     const noexcept;
    size_type max_size() const noexcept;

    // element access:
    mapped_type& operator[](const key_type& k);
    mapped_type& operator[](key_type&& k);

          mapped_type& at(const key_type& k);
    const mapped_type& at(const key_type& k) const;

    // modifiers:
    template <class... Args>
        pair<iterator, bool> emplace(Args&&... args);
    template <class... Args>
        iterator emplace_hint(const_iterator position, Args&&... args);
    pair<iterator, bool> insert(const value_type& v);
    pair<iterator, bool> insert(      value_type&& v);                                // C++17
    template <class P>
        pair<iterator, bool> insert(P&& p);
    iterator insert(const_iterator position, const value_type& v);
    iterator insert(const_iterator position,       value_type&& v);                   // C++17
    template <class P>
        iterator insert(const_iterator position, P&& p);
    template <class InputIterator>
        void insert(InputIterator first, InputIterator last);
    void insert(initializer_list<value_type> il);

    node_type extract(const_iterator position);                                       // C++17
    node_type extract(const key_type& x);                                             // C++17
    insert_return_type insert(node_type&& nh);                                        // C++17
    iterator insert(const_iterator hint, node_type&& nh);                             // C++17

    template <class... Args>
        pair<iterator, bool> try_emplace(const key_type& k, Args&&... args);          // C++17
    template <class... Args>
        pair<iterator, bool> try_emplace(key_type&& k, Args&&... args);               // C++17
    template <class... Args>
        iterator try_emplace(const_iterator hint, const key_type& k, Args&&... args); // C++17
    template <class... Args>
        iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args);      // C++17
    template <class M>
        pair<iterator, bool> insert_or_assign(const key_type& k, M&& obj);            // C++17
    template <class M>
        pair<iterator, bool> insert_or_assign(key_type&& k, M&& obj);                 // C++17
    template <class M>
        iterator insert_or_assign(const_iterator hint, const key_type& k, M&& obj);   // C++17
    template <class M>
        iterator insert_or_assign(const_iterator hint, key_type&& k, M&& obj);        // C++17

    iterator  erase(const_iterator position);
    iterator  erase(iterator position); // C++14
    size_type erase(const key_type& k);
    iterator  erase(const_iterator first, const_iterator last);
    void clear() noexcept;

    template<class C2>
      void merge(map<Key, T, C2, Allocator>& source);         // C++17
    template<class C2>
      void merge(map<Key, T, C2, Allocator>&& source);        // C++17
    template<class C2>
      void merge(multimap<Key, T, C2, Allocator>& source);    // C++17
    template<class C2>
      void merge(multimap<Key, T, C2, Allocator>&& source);   // C++17

    void swap(map& m)
        noexcept(allocator_traits<allocator_type>::is_always_equal::value &&
            is_nothrow_swappable<key_compare>::value); // C++17

    // observers:
    allocator_type get_allocator() const noexcept;
    key_compare    key_comp()      const;
    value_compare  value_comp()    const;

    // map operations:
          iterator find(const key_type& k);
    const_iterator find(const key_type& k) const;
    template<typename K>
        iterator find(const K& x);              // C++14
    template<typename K>
        const_iterator find(const K& x) const;  // C++14

    template<typename K>
      size_type count(const K& x) const;        // C++14
    size_type      count(const key_type& k) const;

    bool           contains(const key_type& x) const;  // C++20
    template<class K> bool contains(const K& x) const; // C++20

          iterator lower_bound(const key_type& k);
    const_iterator lower_bound(const key_type& k) const;
    template<typename K>
        iterator lower_bound(const K& x);              // C++14
    template<typename K>
        const_iterator lower_bound(const K& x) const;  // C++14

          iterator upper_bound(const key_type& k);
    const_iterator upper_bound(const key_type& k) const;
    template<typename K>
        iterator upper_bound(const K& x);              // C++14
    template<typename K>
        const_iterator upper_bound(const K& x) const;  // C++14

    pair<iterator,iterator>             equal_range(const key_type& k);
    pair<const_iterator,const_iterator> equal_range(const key_type& k) const;
    template<typename K>
        pair<iterator,iterator>             equal_range(const K& x);        // C++14
    template<typename K>
        pair<const_iterator,const_iterator> equal_range(const K& x) const;  // C++14
};

template <class InputIterator,
      class Compare = less<iter_key_t<InputIterator>>,
      class Allocator = allocator<iter_to_alloc_t<InputIterator>>>
map(InputIterator, InputIterator, Compare = Compare(), Allocator = Allocator())
  -> map<iter_key_t<InputIterator>, iter_val_t<InputIterator>, Compare, Allocator>; // C++17

template<class Key, class T, class Compare = less<Key>,
    class Allocator = allocator<pair<const Key, T>>>
map(initializer_list<pair<const Key, T>>, Compare = Compare(), Allocator = Allocator())
  -> map<Key, T, Compare, Allocator>; // C++17

template <class InputIterator, class Allocator>
map(InputIterator, InputIterator, Allocator)
  -> map<iter_key_t<InputIterator>, iter_val_t<InputIterator>, less<iter_key_t<InputIterator>>,
    Allocator>; // C++17

template<class Key, class T, class Allocator>
map(initializer_list<pair<const Key, T>>, Allocator) -> map<Key, T, less<Key>, Allocator>; // C++17

template <class Key, class T, class Compare, class Allocator>
bool
operator==(const map<Key, T, Compare, Allocator>& x,
           const map<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator< (const map<Key, T, Compare, Allocator>& x,
           const map<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator!=(const map<Key, T, Compare, Allocator>& x,
           const map<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator> (const map<Key, T, Compare, Allocator>& x,
           const map<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator>=(const map<Key, T, Compare, Allocator>& x,
           const map<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator<=(const map<Key, T, Compare, Allocator>& x,
           const map<Key, T, Compare, Allocator>& y);

// specialized algorithms:
template <class Key, class T, class Compare, class Allocator>
void
swap(map<Key, T, Compare, Allocator>& x, map<Key, T, Compare, Allocator>& y)
    noexcept(noexcept(x.swap(y)));

template <class Key, class T, class Compare, class Allocator, class Predicate>
typename map<Key, T, Compare, Allocator>::size_type
erase_if(map<Key, T, Compare, Allocator>& c, Predicate pred);  // C++20


template <class Key, class T, class Compare = less<Key>,
          class Allocator = allocator<pair<const Key, T>>>
class multimap
{
public:
    // types:
    typedef Key                                      key_type;
    typedef T                                        mapped_type;
    typedef pair<const key_type,mapped_type>         value_type;
    typedef Compare                                  key_compare;
    typedef Allocator                                allocator_type;
    typedef typename allocator_type::reference       reference;
    typedef typename allocator_type::const_reference const_reference;
    typedef typename allocator_type::size_type       size_type;
    typedef typename allocator_type::difference_type difference_type;
    typedef typename allocator_type::pointer         pointer;
    typedef typename allocator_type::const_pointer   const_pointer;

    typedef implementation-defined                   iterator;
    typedef implementation-defined                   const_iterator;
    typedef std::reverse_iterator<iterator>          reverse_iterator;
    typedef std::reverse_iterator<const_iterator>    const_reverse_iterator;
    typedef unspecified                              node_type;              // C++17

    class value_compare
    {
        friend class multimap;
    protected:
        key_compare comp;
        value_compare(key_compare c);
    public:
        typedef bool result_type;  // deprecated in C++17, removed in C++20
        typedef value_type first_argument_type;  // deprecated in C++17, removed in C++20
        typedef value_type second_argument_type;  // deprecated in C++17, removed in C++20
        bool operator()(const value_type& x, const value_type& y) const;
    };

    // construct/copy/destroy:
    multimap()
        noexcept(
            is_nothrow_default_constructible<allocator_type>::value &&
            is_nothrow_default_constructible<key_compare>::value &&
            is_nothrow_copy_constructible<key_compare>::value);
    explicit multimap(const key_compare& comp);
    multimap(const key_compare& comp, const allocator_type& a);
    template <class InputIterator>
        multimap(InputIterator first, InputIterator last, const key_compare& comp);
    template <class InputIterator>
        multimap(InputIterator first, InputIterator last, const key_compare& comp,
                 const allocator_type& a);
    multimap(const multimap& m);
    multimap(multimap&& m)
        noexcept(
            is_nothrow_move_constructible<allocator_type>::value &&
            is_nothrow_move_constructible<key_compare>::value);
    explicit multimap(const allocator_type& a);
    multimap(const multimap& m, const allocator_type& a);
    multimap(multimap&& m, const allocator_type& a);
    multimap(initializer_list<value_type> il, const key_compare& comp = key_compare());
    multimap(initializer_list<value_type> il, const key_compare& comp,
             const allocator_type& a);
    template <class InputIterator>
        multimap(InputIterator first, InputIterator last, const allocator_type& a)
            : multimap(first, last, Compare(), a) {} // C++14
    multimap(initializer_list<value_type> il, const allocator_type& a)
        : multimap(il, Compare(), a) {} // C++14
    ~multimap();

    multimap& operator=(const multimap& m);
    multimap& operator=(multimap&& m)
        noexcept(
            allocator_type::propagate_on_container_move_assignment::value &&
            is_nothrow_move_assignable<allocator_type>::value &&
            is_nothrow_move_assignable<key_compare>::value);
    multimap& operator=(initializer_list<value_type> il);

    // iterators:
          iterator begin() noexcept;
    const_iterator begin() const noexcept;
          iterator end() noexcept;
    const_iterator end()   const noexcept;

          reverse_iterator rbegin() noexcept;
    const_reverse_iterator rbegin() const noexcept;
          reverse_iterator rend() noexcept;
    const_reverse_iterator rend()   const noexcept;

    const_iterator         cbegin()  const noexcept;
    const_iterator         cend()    const noexcept;
    const_reverse_iterator crbegin() const noexcept;
    const_reverse_iterator crend()   const noexcept;

    // capacity:
    bool      empty()    const noexcept;
    size_type size()     const noexcept;
    size_type max_size() const noexcept;

    // modifiers:
    template <class... Args>
        iterator emplace(Args&&... args);
    template <class... Args>
        iterator emplace_hint(const_iterator position, Args&&... args);
    iterator insert(const value_type& v);
    iterator insert(      value_type&& v);                                            // C++17
    template <class P>
        iterator insert(P&& p);
    iterator insert(const_iterator position, const value_type& v);
    iterator insert(const_iterator position,       value_type&& v);                   // C++17
    template <class P>
        iterator insert(const_iterator position, P&& p);
    template <class InputIterator>
        void insert(InputIterator first, InputIterator last);
    void insert(initializer_list<value_type> il);

    node_type extract(const_iterator position);                                       // C++17
    node_type extract(const key_type& x);                                             // C++17
    iterator insert(node_type&& nh);                                                  // C++17
    iterator insert(const_iterator hint, node_type&& nh);                             // C++17

    iterator  erase(const_iterator position);
    iterator  erase(iterator position); // C++14
    size_type erase(const key_type& k);
    iterator  erase(const_iterator first, const_iterator last);
    void clear() noexcept;

    template<class C2>
      void merge(multimap<Key, T, C2, Allocator>& source);    // C++17
    template<class C2>
      void merge(multimap<Key, T, C2, Allocator>&& source);   // C++17
    template<class C2>
      void merge(map<Key, T, C2, Allocator>& source);         // C++17
    template<class C2>
      void merge(map<Key, T, C2, Allocator>&& source);        // C++17

    void swap(multimap& m)
        noexcept(allocator_traits<allocator_type>::is_always_equal::value &&
            is_nothrow_swappable<key_compare>::value); // C++17

    // observers:
    allocator_type get_allocator() const noexcept;
    key_compare    key_comp()      const;
    value_compare  value_comp()    const;

    // map operations:
          iterator find(const key_type& k);
    const_iterator find(const key_type& k) const;
    template<typename K>
        iterator find(const K& x);              // C++14
    template<typename K>
        const_iterator find(const K& x) const;  // C++14

    template<typename K>
      size_type count(const K& x) const;        // C++14
    size_type      count(const key_type& k) const;

    bool           contains(const key_type& x) const;  // C++20
    template<class K> bool contains(const K& x) const; // C++20

          iterator lower_bound(const key_type& k);
    const_iterator lower_bound(const key_type& k) const;
    template<typename K>
        iterator lower_bound(const K& x);              // C++14
    template<typename K>
        const_iterator lower_bound(const K& x) const;  // C++14

          iterator upper_bound(const key_type& k);
    const_iterator upper_bound(const key_type& k) const;
    template<typename K>
        iterator upper_bound(const K& x);              // C++14
    template<typename K>
        const_iterator upper_bound(const K& x) const;  // C++14

    pair<iterator,iterator>             equal_range(const key_type& k);
    pair<const_iterator,const_iterator> equal_range(const key_type& k) const;
    template<typename K>
        pair<iterator,iterator>             equal_range(const K& x);        // C++14
    template<typename K>
        pair<const_iterator,const_iterator> equal_range(const K& x) const;  // C++14
};

template <class InputIterator,
      class Compare = less<iter_key_t<InputIterator>>,
      class Allocator = allocator<iter_to_alloc_t<InputIterator>>>
multimap(InputIterator, InputIterator, Compare = Compare(), Allocator = Allocator())
  -> multimap<iter_key_t<InputIterator>, iter_val_t<InputIterator>, Compare, Allocator>; // C++17

template<class Key, class T, class Compare = less<Key>,
    class Allocator = allocator<pair<const Key, T>>>
multimap(initializer_list<pair<const Key, T>>, Compare = Compare(), Allocator = Allocator())
  -> multimap<Key, T, Compare, Allocator>; // C++17

template <class InputIterator, class Allocator>
multimap(InputIterator, InputIterator, Allocator)
  -> multimap<iter_key_t<InputIterator>, iter_val_t<InputIterator>,
    less<iter_key_t<InputIterator>>, Allocator>; // C++17

template<class Key, class T, class Allocator>
multimap(initializer_list<pair<const Key, T>>, Allocator)
  -> multimap<Key, T, less<Key>, Allocator>; // C++17

template <class Key, class T, class Compare, class Allocator>
bool
operator==(const multimap<Key, T, Compare, Allocator>& x,
           const multimap<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator< (const multimap<Key, T, Compare, Allocator>& x,
           const multimap<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator!=(const multimap<Key, T, Compare, Allocator>& x,
           const multimap<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator> (const multimap<Key, T, Compare, Allocator>& x,
           const multimap<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator>=(const multimap<Key, T, Compare, Allocator>& x,
           const multimap<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator<=(const multimap<Key, T, Compare, Allocator>& x,
           const multimap<Key, T, Compare, Allocator>& y);

// specialized algorithms:
template <class Key, class T, class Compare, class Allocator>
void
swap(multimap<Key, T, Compare, Allocator>& x,
     multimap<Key, T, Compare, Allocator>& y)
    noexcept(noexcept(x.swap(y)));

template <class Key, class T, class Compare, class Allocator, class Predicate>
typename multimap<Key, T, Compare, Allocator>::size_type
erase_if(multimap<Key, T, Compare, Allocator>& c, Predicate pred);  // C++20

}  // std

*/

#include <__algorithm/equal.h>
#include <__algorithm/lexicographical_compare.h>
#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
#include <__functional/binary_function.h>
#include <__functional/is_transparent.h>
#include <__functional/operations.h>
#include <__iterator/erase_if_container.h>
#include <__iterator/iterator_traits.h>
#include <__iterator/reverse_iterator.h>
#include <__memory/allocator.h>
#include <__memory_resource/polymorphic_allocator.h>
#include <__node_handle>
#include <__tree>
#include <__type_traits/is_allocator.h>
#include <__utility/forward.h>
#include <__utility/piecewise_construct.h>
#include <__utility/swap.h>
#include <tuple>
#include <type_traits>
#include <version>

// standard-mandated includes

// [iterator.range]
#include <__iterator/access.h>
#include <__iterator/data.h>
#include <__iterator/empty.h>
#include <__iterator/reverse_access.h>
#include <__iterator/size.h>

// [associative.map.syn]
#include <compare>
#include <initializer_list>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Key, class _CP, class _Compare,
          bool = is_empty<_Compare>::value && !__libcpp_is_final<_Compare>::value>
class __map_value_compare
    : private _Compare
{
public:
    _LIBCPP_INLINE_VISIBILITY
    __map_value_compare()
        _NOEXCEPT_(is_nothrow_default_constructible<_Compare>::value)
        : _Compare() {}
    _LIBCPP_INLINE_VISIBILITY
    __map_value_compare(_Compare __c)
        _NOEXCEPT_(is_nothrow_copy_constructible<_Compare>::value)
        : _Compare(__c) {}
    _LIBCPP_INLINE_VISIBILITY
    const _Compare& key_comp() const _NOEXCEPT {return *this;}
    _LIBCPP_INLINE_VISIBILITY
    bool operator()(const _CP& __x, const _CP& __y) const
        {return static_cast<const _Compare&>(*this)(__x.__get_value().first, __y.__get_value().first);}
    _LIBCPP_INLINE_VISIBILITY
    bool operator()(const _CP& __x, const _Key& __y) const
        {return static_cast<const _Compare&>(*this)(__x.__get_value().first, __y);}
    _LI                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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