list push_back() function in C++ STL

The list:push_back() function in C++ STL is used to add a new element to an existing list container. It takes the element to be added as a parameter and adds it to the list container.
Syntax: 

list_name.push_back(value) 

Parameters: This function accepts a single parameter which is mandatory value. This refers to the element needed to be added to the list, list_name.
Return Value: The return type of this function is void and it does not returns any value. 
Below program illustrates the list::push_back() function. 

CPP

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

int main()
{
 // Initialization of list
 list<int> demo_list;

 // initial size of list
 cout << "Initial Size of the list: "
  << demo_list.size() << endl;

 // Adding elements to the list
 // using push_back function
 demo_list.push_back(10);
 demo_list.push_back(20);
 demo_list.push_back(30);

 // Size of list after adding
 // some elements
 cout << "Size of list after adding three "
  << "elements: " << demo_list.size();

 return 0;
}

Output:

Initial Size of the list: 0
Size of list after adding three elements: 3

Time Complexity: O(1)

Auxiliary Space: O(1)

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