Permutation of String letters: How to remove repeated permutations?

Question

Here is a standard function to print the permutations of characters of a string:

void permute(char *a, int i, int n)
{
   int j;
   if (i == n)
     printf(\         


        

Answer 1

void permute(string set, string prefix = ""){
    if(set.length() == 1){
            cout<<"\n"<

And simply use it as permute("word");