#----------------------------------------------------------------------- # towersofhanoi.py #----------------------------------------------------------------------- import sys import stdio #----------------------------------------------------------------------- # Write to standard output instructions to move n Towers of Hanoi # disks to the left (if parameter left is True) or to the right (if # parameter left is False). def moves(n, left): if n == 0: return moves(n-1, not left) if left: stdio.writeln(str(n) + ' left') else: stdio.writeln(str(n) + ' right') moves(n-1, not left) #----------------------------------------------------------------------- # Accept integer n as a command-line argument. Write to standard output # instructions to move n Towers of Hanoi disks to the left. def main(): n = int(sys.argv[1]) moves(n, True) if __name__ == '__main__': main() #----------------------------------------------------------------------- # python towersofhanoi.py 1 # 1 left # python towersofhanoi.py 2 # 1 right # 2 left # 1 right # python towersofhanoi.py 3 # 1 left # 2 right # 1 left # 3 left # 1 left # 2 right # 1 left # python towersofhanoi.py 4 # 1 right # 2 left # 1 right # 3 right # 1 right # 2 left # 1 right # 4 left # 1 right # 2 left # 1 right # 3 right # 1 right # 2 left # 1 right