// output of ./demo/comb/perm-pref-demo.cc: // Description: //% All permutations via prefix shifts ("cool-lex" order) arg 1: 4 == n [Permutations of n elements.] default=4 1: [ . 3 2 1 ] 4 [ . 1 2 3 ] 2: [ 3 . 2 1 ] 2 [ 1 . 2 3 ] 3: [ 2 3 . 1 ] 3 [ 2 1 . 3 ] 4: [ . 2 3 1 ] 3 [ . 2 1 3 ] 5: [ 2 . 3 1 ] 2 [ 2 . 1 3 ] 6: [ 3 2 . 1 ] 3 [ 1 2 . 3 ] 7: [ 1 3 2 . ] 4 [ 3 1 2 . ] 8: [ 3 1 2 . ] 2 [ 1 3 2 . ] 9: [ . 3 1 2 ] 4 [ . 1 3 2 ] 10: [ 3 . 1 2 ] 2 [ 1 . 3 2 ] 11: [ 1 3 . 2 ] 3 [ 3 1 . 2 ] 12: [ . 1 3 2 ] 3 [ . 3 1 2 ] 13: [ 1 . 3 2 ] 2 [ 3 . 1 2 ] 14: [ 3 1 . 2 ] 3 [ 1 3 . 2 ] 15: [ 2 3 1 . ] 4 [ 2 1 3 . ] 16: [ 1 2 3 . ] 3 [ 3 2 1 . ] 17: [ 2 1 3 . ] 2 [ 2 3 1 . ] 18: [ . 2 1 3 ] 4 [ . 2 3 1 ] 19: [ 2 . 1 3 ] 2 [ 2 . 3 1 ] 20: [ 1 2 . 3 ] 3 [ 3 2 . 1 ] 21: [ . 1 2 3 ] 3 [ . 3 2 1 ] 22: [ 1 . 2 3 ] 2 [ 3 . 2 1 ] 23: [ 2 1 . 3 ] 3 [ 2 3 . 1 ] 24: [ 3 2 1 . ] 4 [ 1 2 3 . ] ct=24