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set::rbegin() and set::rend() in C++ STL

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  1. set::rbegin() is a built-in function in C++ STL which returns a reverse iterator pointing to the last element in the container. Syntax:
    reverse_iterator set_name.rbegin()
    
    Parameters: The function does not take any parameter. Return value: The function returns a reverse iterator pointing to the last element in the container. Program to demonstrate the set::rbegin() method: Program 1:
    // CPP program to demonstrate the
    // set::rbegin() function
    #include <bits/stdc++.h>
    using namespace std;
    int main()
    {
      
        int arr[] = { 14, 12, 15, 11, 10 };
      
        // initializes the set from an array
        set<int> s(arr, arr + 5);
      
        set<int>::reverse_iterator rit;
      
        // prints all elements in reverse order
        for (rit = s.rbegin(); rit != s.rend(); rit++)
            cout << *rit << " ";
      
        cout << "\nThe last element in set is " << *(s.rbegin());
      
        return 0;
    }
    
                        
    Output:
    15 14 12 11 10 
    The last element in set is 15
    

  2. set::rend() in an inbuilt function in C++ STL which returns a reverse iterator pointing to the theoretical element right before the first element in the set container. Syntax:
    reverse_iterator set_name.rend()
    
    Parameter: The function does not accepts any parameter. Return value: The function returns a reverse iterator pointing to the theoretical element right before the first element in the set container. Below programs illustrate the function: Program 1:
    // CPP program to demonstrate the
    // set::rend() function
    #include <bits/stdc++.h>
    using namespace std;
    int main()
    {
      
        int arr[] = { 4, 3, 5, 1, 2 };
      
        // initializes the set from an array
        set<int> s(arr, arr + 5);
      
        set<int>::reverse_iterator rit;
      
        // prints all elements in reverse order
        for (rit = s.rbegin(); rit != s.rend(); rit++)
            cout << *rit << " ";
      
        return 0;
    }
    
                        
    Output:
    5 4 3 2 1
    


Last Updated : 19 Jun, 2018
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