The rbegin() is a function in C++ STL. It returns a reverse iterator which points to the last element of the map. The reverse iterator iterates in reverse order and incrementing it means moving towards beginning of map.
SYNTAX:
r_i rbegin(); const_r_i rbegin() const;
Parameters:
It does not except any parameters.
Return Value: This method throws a reverse iterator to the reverse beginning of the sequence container.
Time Complexity:
O(1)
Example:
#include <iostream> #include <map> using namespace std;
int main()
{ map< char , int > mp = {
{ 'a' , 1 },
{ 'b' , 2 },
{ 'c' , 3 },
{ 'd' , 4 },
{ 'e' , 5 },
};
cout << "Map contains "
<< "following elements in"
<< " reverse order"
<< endl;
for ( auto i = mp.rbegin(); i != mp.rend(); ++i) {
cout << i->first
<< " = "
<< i->second
<< endl;
}
return 0;
} |
Output:
Map contains following elements in reverse order e = 5 d = 4 c = 3 b = 2 a = 1
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