#!/opt/local/bin/python # # See ../README.md # # # Run as: python ch-2.py < input-file # import fileinput def shortest_path (matrix, start, to, exclude): if 1 + len (exclude . keys ()) == len (matrix): return matrix [start] [to], [to] shortest = 9999999999999999999 sh_path = [] new_exclude = exclude . copy () new_exclude [start] = 1 for next in range (len (matrix)): if next == start or next == to or next in exclude: continue length, path = shortest_path (matrix, next, to, new_exclude) if shortest > length + matrix [start] [next]: shortest = length + matrix [start] [next] sh_path = [next] + path return shortest, sh_path matrix = [] for line in fileinput . input (): matrix . append (list (map (lambda x: int (x), line . split (" ")))) length, path = shortest_path (matrix, 0, 0, {}) print (length) print (0, " " . join (map (lambda x: str (x), path)))