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list size() function in C++ STL

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  • Last Updated : 02 Dec, 2022
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The list::size() is a built-in function in C++ STL that is used to find the number of elements present in a list container. That is, it is used to find the size of the list container.
Syntax:

list_name.size();

Time Complexity – Linear O(1) as per c++11 standard. Possible because the implementation maintains the size field.

Parameters: This function does not accept any parameter.
Return Value: This function returns the number of elements present in the list container list_name. Below program illustrate the list::size() function in C++ STL: 

CPP




// CPP program to illustrate the
// list::size() function
#include <bits/stdc++.h>
using namespace std;
 
int main()
{
    // Creating a list
    list<int> demoList;
 
    // Add elements to the List
    demoList.push_back(10);
    demoList.push_back(20);
    demoList.push_back(30);
    demoList.push_back(40);
 
    // getting size of the list
    int size = demoList.size();
 
    cout << "The list contains " << size << " elements";
 
    return 0;
}

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