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Showing content from https://www.geeksforgeeks.org/cpp/list-reverse-function-in-c-stl/ below:

list reverse function in C++ STL

Last Updated : 28 Jun, 2023

The list::reverse() is a built-in function in C++ STL which is used to reverse a list container. It reverses the order of elements in the list container.

Syntax:

list_name.reverse()

Parameters: This function does not accept any parameters.

Return Value: This function does not return any value. It just reverses the order of elements in the list container with which it is used.

Below program illustrate the list::reverse() function in C++ STL: 

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

int main()
{
    // Creating a list
    list<int> demoList;

    // Adding elements to the list
    demoList.push_back(10);
    demoList.push_back(20);
    demoList.push_back(30);
    demoList.push_back(40);

    // Initial list:
    cout << "Initial List: ";
    for (auto itr = demoList.begin(); itr != demoList.end(); itr++)
        cout << *itr << " ";

    // reversing the list
    demoList.reverse();

    // List after reversing the order of elements
    cout << "\n\nList after reversing: ";
    for (auto itr = demoList.begin(); itr != demoList.end(); itr++)
        cout << *itr << " ";

    return 0;
}

Initial List: 10 20 30 40 

List after reversing: 40 30 20 10

Time Complexity - Linear O(N)

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