Prev_Permutation in C++ STL

This C++ Program demonstrates implementation of Prev_Permutation in STL.

Here is source code of the C++ Program to demonstrate Prev_Permutation 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 Prev_Permutation in Stl

```
 */
```
```
#include <iostream>
```
```
#include <algorithm>
```
```
using namespace std;
```
```
void display(int a[], int n)
```
```
{
```
```
    for(int i = 0; i < n; i++)
```
```
    {
```
```
        cout<<a[i]<<"  ";
```
```
    }
```
```
    cout<<endl;
```
```
}
```
```
int main ()
```
```
{
```
```
    int num, i;
```

    cout<<"Enter number of elements to be inserted: ";

```
    cin>>num;
```
```
    int myints[num];
```
```
    for (i = 0; i < num; i++)
```
```
    {
```

        cout<<"Enter "<<i + 1<<" element: ";

```
        cin>>myints[i];
```
```
    }
```
```
    sort (myints, myints + num);
```
```
    reverse (myints, myints + num);
```

    cout << "The "<<num<<"! possible permutations with ";

```
    cout<<num<<" elements: "<<endl;
```
```
    do
```
```
    {
```
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        display(myints, num);
```
```
    }
```

    while (prev_permutation(myints, myints + num));

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

$ g++ Prev_Permutation.cpp
$ a.out
Enter number of elements to be inserted: 3
Enter 1 element: 3
Enter 2 element: 2
Enter 3 element: 1
The 3! possible permutations with 3 elements: 
3  2  1  
3  1  2  
2  3  1  
2  1  3  
1  3  2  
1  2  3  
 
 
------------------
(program exited with code: 0)
Press return to continue

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