*Function to permute the string :*
void permute(char *a, int i, int n) //n = Length of the string, i=starting
element of the array.
{
int j;
if (i == n)
printf("%s\n", a);
else
{
for (j = i; j <= n; j++)
{
swap((a+i), (a+j));
permute(a, i+1, n);
swap((a+i), (a+j)); //backtrack
}
}
}
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