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Showing content from https://cplusplus.com/reference/map/map/rbegin/ below:

public member function

<map>

std::map::rbegin 
      reverse_iterator rbegin();const_reverse_iterator rbegin() const;
      reverse_iterator rbegin() noexcept;const_reverse_iterator rbegin() const noexcept;

Return reverse iterator to reverse beginning

Returns a reverse iterator pointing to the last element in the container (i.e., its reverse beginning).

Reverse iterators iterate backwards: increasing them moves them towards the beginning of the container.

rbegin points to the element preceding the one that would be pointed to by member end.



Parameters none

Return Value A reverse iterator to the reverse beginning of the sequence container.

If the map object is const-qualified, the function returns a const_reverse_iterator. Otherwise, it returns a reverse_iterator.

Member types reverse_iterator and const_reverse_iterator are reverse bidirectional iterator types pointing to elements. See map member types.



Example 
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// map::rbegin/rend
#include <iostream>
#include <map>

int main ()
{
  std::map<char,int> mymap;

  mymap['x'] = 100;
  mymap['y'] = 200;
  mymap['z'] = 300;

  // show content:
  std::map<char,int>::reverse_iterator rit;
  for (rit=mymap.rbegin(); rit!=mymap.rend(); ++rit)
    std::cout << rit->first << " => " << rit->second << '\n';

  return 0;
}

Output: 
z => 300
y => 200
x => 100


Complexity Constant.

Iterator validity No changes.

Data races The container is accessed (neither the const nor the non-const versions modify the container).
No contained elements are accessed by the call, but the iterator returned can be used to access or modify elements. Concurrently accessing or modifying different elements is safe.

Exception safetyNo-throw guarantee: this member function never throws exceptions.
The copy construction or assignment of the returned iterator is also guaranteed to never throw.

See also
map::rend
Return reverse iterator to reverse end (public member function)
map::begin
Return iterator to beginning (public member function)
map::end
Return iterator to end (public member function)

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