Johnson trotter algorithm gives a non recursive approach to generate permutations. The algorithm goes something like this..
while there exists a mobile integer k do
-->find the largest mobile integer k;
-->swap k and the adjacent integer its arrow points to;
-->reverse the direction of all integers that are larger than k
I'm using a character flag to maintain the direction of the mobile integers.. the code is simple, suggestions to make it more simple are always welcome :)
