How to reverse a Vector using STL in C++?

Given a vector, reverse this vector using STL in C++.

Example:

Input: vec = {1, 45, 54, 71, 76, 12}
Output: {12, 76, 71, 54, 45, 1}

Input: vec = {1, 7, 5, 4, 6, 12}
Output: {12, 6, 4, 5, 7, 1}

Approach: Reversing can be done with the help of reverse() function provided in STL.



Syntax:

reverse(start_index, last_index);
filter_none

edit
close

play_arrow

link
brightness_4
code

// C++ program to reverse Vector
// using reverse() in STL
  
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // Get the vector
    vector<int> a = { 1, 45, 54, 71, 76, 12 };
  
    // Print the vector
    cout << "Vector: ";
    for (int i = 0; i < a.size(); i++)
        cout << a[i] << " ";
    cout << endl;
  
    // Reverse the vector
    reverse(a.begin(), a.end());
  
    // Print the reversed vector
    cout << "Reversed Vector: ";
    for (int i = 0; i < a.size(); i++)
        cout << a[i] << " ";
    cout << endl;
  
    return 0;
}

chevron_right


Output:

Vector: 1 45 54 71 76 12 
Reversed Vector: 12 76 71 54 45 1


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :
Practice Tags :


1


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.