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unordered_multiset find() function in C++STL

  • Last Updated : 02 Aug, 2018

The unordered_multiset::find() is a built-in function in C++ STL which returns an iterator which points to the position which has the element val. If the element does not contain the element val, then it returns an iterator which points to a position past the last element in the container.

Syntax:

unordered_multiset_name.find(val)

Parameters: The function accepts a mandatory parameter val whose position’s iterator is to be returned.

Return Value: It returns an iterator which points to the position where val is.

Below programs illustrate the above function:

Program 1:




// C++ program to illustrate the
// unordered_multiset::find() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // declaration
    unordered_multiset<int> sample;
  
    // inserts element
    sample.insert(100);
    sample.insert(100);
    sample.insert(100);
    sample.insert(200);
    sample.insert(500);
    sample.insert(500);
    sample.insert(600);
  
    // find the position of 500 and print
    auto it = sample.find(500);
    if (it != sample.end())
        cout << *it << endl;
    else
        cout << "500 not found\n";
  
    // find the position of 300 and print
    it = sample.find(300);
    if (it != sample.end())
        cout << *it << endl;
    else
        cout << "300 not found\n";
  
    // find the position of 100 and print
    it = sample.find(100);
    if (it != sample.end())
        cout << *it << endl;
    else
        cout << "100 not found\n";
  
    return 0;
}
Output:
500
300 not found
100

Program 2:




// C++ program to illustrate the
// unordered_multiset::find() 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('b');
    sample.insert('c');
    sample.insert('d');
    sample.insert('d');
    sample.insert('d');
  
    // find the position of 'a' and print
    auto it = sample.find('a');
    if (it != sample.end())
        cout << *it << endl;
    else
        cout << "a not found\n";
  
    // find the position of 'z' and print
    it = sample.find('z');
    if (it != sample.end())
        cout << *it << endl;
    else
        cout << "z not found\n";
  
    return 0;
}
Output:
a
z not found

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