list pop_back() function in C++ STL

The list::pop_back() is a built-in function in C++ STL which is used to remove an element from the back of a list container. That is, this function deletes the last element of a list container. This function thus decreases the size of the container by 1 as it deletes an element from the end of list. Syntax:

list_name.pop_back();

Parameters: The function does not accept any parameter. Return Value: This function does not returns anything. Below program illustrate the list::pop_back() function in C++ STL: 

CPP

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

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

 // Adding elements to the list
 // using push_back()
 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 << " ";

 // removing an element from the end of List
 // using pop_back
 demoList.pop_back();

 // List after removing element from end
 cout << "\n\nList after removing an element from end: ";
 for (auto itr = demoList.begin(); itr != demoList.end(); itr++)
  cout << *itr << " ";

 return 0;
}

Output:

Initial List: 10 20 30 40 

List after removing an element from end: 10 20 30

Time Complexity: O(1)

Auxiliary Space: O(1)

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