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list push_front() function in C++ STL

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  • Difficulty Level : Basic
  • Last Updated : 13 Jun, 2022

The list::push_front() is a built-in function in C++ STL which is used to insert an element at the front of a list container just before the current top element. This function also increases the size of the container by 1. Syntax:

list_name.push_front(dataType value)

Parameters: This function accepts a single parameter value. This parameter represents the element which is needed to be inserted at the front of the list container. Return Value: This function does not return anything. Below program illustrate the list::push_front() function in C++ STL: 

CPP




// CPP program to illustrate the
// list::push_front() 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 << " ";
 
 // Adding elements to the front of List
 // using push_front
 demoList.push_front(5);
 
 // List after adding elements to front
 cout << "\n\nList after adding elements to the front:\n";
 for (auto itr = demoList.begin(); itr != demoList.end(); itr++)
  cout << *itr << " ";
 
 return 0;
}

Output:

Initial List: 10 20 30 40 

List after adding elements to the front:
5 10 20 30 40

Time Complexity: O(n)

Auxiliary Space: O(1)

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