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

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  • Difficulty Level : Basic
  • Last Updated : 09 Jun, 2022
  1. vector::rbegin() is a built-in function in C++ STL which returns a reverse iterator pointing to the last element in the container. 
    Syntax: 
     
vector_name.rbegin()
  1. Parameters: The function does not accept any parameter.
    Return value: The function returns a reverse iterator pointing to the last element in the container.
    Program to demonstrate the vector::rbegin() method: 
    Program 1: 
     

CPP




// CPP program to illustrate
// the vector::rbegin() function
#include <bits/stdc++.h>
using namespace std;
 
int main()
{
    vector<int> v;
    v.push_back(11);
    v.push_back(12);
    v.push_back(13);
    v.push_back(14);
    v.push_back(15);
 
    // prints all the elements
    cout << "The vector elements in reverse order are:\n";
    for (auto it = v.rbegin(); it != v.rend(); it++)
        cout << *it << " ";
    return 0;
}

  1.  
Output: 

The vector elements in reverse order are:
15 14 13 12 11

 

 Time Complexity – constant O(1)

  1. vector::rend() is a built-in function in C++ STL which returns a reverse iterator pointing to the theoretical element right before the first element in the vector container.
    Syntax: 
     
vector_name.rend()
  1. Parameters: The function does not take any parameter.
    Return value: The function returns a reverse iterator pointing to the theoretical element right before the first element in the vector container.
    Program to demonstrate the vector::rend() method: 
    Program 1: 
     

CPP




// CPP program to illustrate
// the vector::rend() function
#include <bits/stdc++.h>
using namespace std;
 
int main()
{
    vector<int> v;
    v.push_back(11);
    v.push_back(12);
    v.push_back(13);
    v.push_back(14);
    v.push_back(15);
 
    cout << "The last element is: " << *v.rbegin();
 
    // prints all the elements
    cout << "\nThe vector elements in reverse order are:\n";
    for (auto it = v.rbegin(); it != v.rend(); it++)
        cout << *it << " ";
    return 0;
}

  1.  
Output: 

The last element is: 15
The vector elements in reverse order are:
15 14 13 12 11

 

 Time Complexity – constant O(1)


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