unordered_multiset count() function in C++ STL

The unordered_multiset::count() is a built-in function in C++ STL which returns the count of elements in the unordered_multiset container which is equal to a given value.

Syntax:

unordered_multiset_name.count(val)

Parameters: The function accepts a single mandatory parameter val which specifies the element whose count in the unordered_multiset container is to be returned.

Return Value: It returns an unsigned integral type which denotes the number of times a value occurs in the container.

Below programs illustrates the above function:

Program 1:

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// C++ program to illustrate the
// unordered_multiset::count() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // declaration
    unordered_multiset<int> sample;
  
    // inserts element
    sample.insert(11);
    sample.insert(11);
    sample.insert(11);
    sample.insert(12);
    sample.insert(13);
    sample.insert(13);
    sample.insert(14);
  
    cout << "11 occurs " << sample.count(11) << " times";
    cout << "\n12 occurs " << sample.count(13) << " times";
    cout << "\n13 occurs " << sample.count(13) << " times";
    cout << "\n14 occurs " << sample.count(14) << " times";
  
    return 0;
}

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Output:

11 occurs 3 times
12 occurs 2 times
13 occurs 2 times
14 occurs 1 times

Program 2:

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// C++ program to illustrate the
// unordered_multiset::count() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // declaration
    unordered_multiset<char> sample;
  
    // inserts element
    sample.insert('a');
    sample.insert('a');
    sample.insert('a');
    sample.insert('b');
    sample.insert('b');
    sample.insert('c');
    sample.insert('c');
  
    cout << "a occurs " << sample.count('a') << " times";
    cout << "\nb occurs " << sample.count('b') << " times";
    cout << "\nc occurs " << sample.count('c') << " times";
  
    return 0;
}

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Output:

a occurs 3 times
b occurs 2 times
c occurs 2 times


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