Multimap in C++ - Sanfoundry

This C++ Program demonstrates the implementation of Multimap in STL.

Here is source code of the C++ Program to implement Multimap in STL. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Implement Multimap in STL

```
 */
```
```
#include <iostream>
```
```
#include <map>
```
```
#include <string>
```
```
using namespace std;
```
```
int main ()
```
```
{
```
```
    multimap<char, int> mymm;
```
```
    multimap<char, int>::iterator it;
```

    mymm.insert (pair<char, int>('x', 100));

    mymm.insert (pair<char, int>('y', 200));

    mymm.insert (pair<char, int>('y', 300));

    mymm.insert (pair<char, int>('y', 400));

    mymm.insert (pair<char, int>('z', 500));

    mymm.insert (pair<char, int>('z', 500));

    cout<<"Size of the multimap: "<< mymm.size() <<endl;

```
    cout << "Multimap contains:\n";
```

    for (it = mymm.begin(); it != mymm.end(); ++it)

        cout << (*it).first << " => " << (*it).second << '\n';

```
    for (char c = 'x'; c <= 'z'; c++)
```
```
    {
```

        cout << "There are " << mymm.count(c) << " elements with key " << c << ":";

        multimap<char, int>::iterator it;

        for (it = mymm.equal_range(c).first; it != mymm.equal_range(c).second; ++it)

            cout << ' ' << (*it).second;

```
        cout << endl;
```
```
    }
```
```
    it = mymm.find('x');
```
```
    mymm.erase (it);
```

    cout<<"Size of the multimap: "<<mymm.size()<<endl;

```
    // showing contents:
```
```
    cout << "Multimap contains:\n";
```

    for (it = mymm.begin(); it != mymm.end(); ++it)

        cout << (*it).first << " => " << (*it).second << '\n';

```
    return 0;
```
```
}
```

$ g++ multimap_stl.cpp
$ a.out
 
Size of the multimap: 6
Multimap contains:
x => 100
y => 200
y => 300
y => 400
z => 500
z => 500
There are 1 elements with key x: 100
There are 3 elements with key y: 200 300 400
There are 2 elements with key z: 500 500
Size of the multimap: 5
Multimap contains:
y => 200
y => 300
y => 400
z => 500
z => 500
 
------------------
(program exited with code: 1)
Press return to continue

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