#include <algorithm>
#include <iostream>
#inlcude <string>
int main()
{
  std::string s = "Hallo";                  // niedrigste Permutation
  std::prev_permutation(begin(s), end(s));  // hoechste Permutation
  do
  {
    std::cout << s << '\n';                 // absteigend ausgeben 
  } while (std::prev_permutation(begin(s), end(s)));
}