list push_front() function in C++ STL
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.
Example
The below program illustrate the list::push_front() function in C++ STL.
// 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(1)
Auxiliary Space: O(1)
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