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multimap size() function in C++ STL

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The multimap::size() is a built-in function in C++ STL which returns the number of elements in the multimap container. 

Syntax:

multimap_name.size()

Parameters: The function does not accept any parameter. 

Return Value: This function returns the number of elements a multimap container has. 

CPP

// C++ function for illustration
// multimap::size() function
#include <bits/stdc++.h>
using namespace std;
 
int main()
{
 
    // initialize container
    multimap<int, int> mp;
 
    // insert elements in random order
    mp.insert({ 2, 30 });
    mp.insert({ 1, 40 });
    mp.insert({ 2, 60 });
    mp.insert({ 2, 20 });
    mp.insert({ 1, 50 });
    mp.insert({ 4, 50 });
 
    cout << "multimap mp has " << mp.size()
        << " number of elements";
    return 0;
}

                    
Output:
multimap mp has 6 number of elements

Time Complexity: O(1)


Last Updated : 12 Jun, 2023
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