list rbegin() and rend() function in C++ STL

list::rbegin() is an inbuilt function in C++ STL that returns a reverse iterator which points to the last element of the list.

Syntax:

list_name.rbegin()

Parameter: This function does not accept any parameters.

Return value: It returns a reverse iterator which points to the last element of the list.

Below program illustrates the above function: 

// C++ program to illustrate the 
// list::rbegin() function 
#include <bits/stdc++.h> 
using namespace std; 

int main() 
{ 
 list<int> lis = { 10, 20, 30, 40, 50 }; 

 cout << "The list in reverse order: "; 

 for (auto it = lis.rbegin(); it != lis.rend(); ++it) 
  cout << *it << " "; 

 return 0; 
} 

The list in reverse order: 50 40 30 20 10

Time Complexity: O(n)
Auxiliary Space: O(1)

list::rend() is an inbuilt function in C++ STL that returns a reverse iterator which points to the position before the beginning of the list.

Syntax:

list_name.rend()

Parameter: The function does not accept any parameters.

Return value: It returns a reverse iterator which points to the position before the beginning of the list.

Below program illustrates the above function: 

// C++ program to illustrate the 
// list::rbegin() function 
#include <bits/stdc++.h> 
using namespace std; 

int main() 
{ 
 list<int> lis = { 10, 20, 30, 40, 50 }; 

 cout << "The list in reverse order: "; 

 for (auto it = lis.rbegin(); it != lis.rend(); ++it) 
  cout << *it << " "; 

 return 0; 
} 

The list in reverse order: 50 40 30 20 10

Time Complexity: O(n)
Auxiliary Space: O(1)