C++ Standard Library C++ STL Library

C++ multiset - count() Function



The C++ multiset::count function returns the number of occurrences of an element in the multiset container.

Syntax

size_type count (const value_type& val) const;
size_type count (const value_type& val) const;

Parameters

val Specify value to search for.

Return Value

Number of occurrences of the val in the multiset container.

Time Complexity

Logarithmic i.e, Θ(log(n)).

Example:

In the example below, the multiset::count function is used to find out the number of occurrences of specified element in the multiset called MyMSet.

#include <iostream>
#include <set>
using namespace std;
 
int main (){
  multiset<int> MyMSet{55, 25, 128, 5, 7, 5};

  for(int i=5; i<10; i++)
     cout<<i<<" appeared "<<MyMSet.count(i)<<" times in the MyMSet.\n";

  return 0;
}

The output of the above code will be:

5 appeared 2 times in the MyMSet.
6 appeared 0 times in the MyMSet.
7 appeared 1 times in the MyMSet.
8 appeared 0 times in the MyMSet.
9 appeared 0 times in the MyMSet.

❮ C++ <set> Library

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