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