Permutations by swapping: Difference between revisions

Generate permutations of n items usingin algorithmswhich basedsuccessive onpermutations differ from each other by the swapping of any two items. Also generate the sign of the permutation which is +1 when the permutation is generated from an even number of swaps from the initial state, and -1 for odd. Show the permutations and signs of three items, in order of generation ''here''.