C++ Program to Generate All Permutations using BackTracking

This C++ Program demonstrates the generation of all Permutations using BackTracking.

Here is source code of the C++ Program to Generate All Permutations using BackTracking. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Generate All Permutations using BackTracking

```
 */
```
```
#include <iostream>
```
```
#include <cstdio>
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```
#include <cstring>
```
```
#include <cstdlib>
```
```
using namespace std;
```
```
 
```
```
/* swap values at two pointers */
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void swap (char *x, char *y)
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{
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    char temp;
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    temp = *x;
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    *x = *y;
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    *y = temp;
```
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}
```
```
 
```
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/* print permutations of string */
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void permute(char *a, int i, int n)
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```
{
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    int j;
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    if (i == n)
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        cout<<a<<endl;
```
```
    else
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    {
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        for (j = i; j <= n; j++)
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        {
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            swap((a + i), (a + j));
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            permute(a, i + 1, n);
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            swap((a+i), (a + j));
```
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       }
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   }
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}
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```
 
```
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/* Main*/
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int main()
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{
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    char a[] = "abcd";
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    permute(a, 0, 3);
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    return 0;
```
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}
```

$ g++ permutations_back.cpp
$ a.out
 
abcd
abdc
acbd
acdb
adcb
adbc
bacd
badc
bcad
bcda
bdca
bdac
cbad
cbda
cabd
cadb
cdab
cdba
dbca
dbac
dcba
dcab
dacb
dabc
 
------------------
(program exited with code: 1)
Press return to continue

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