a good acm subject, although probably not out to answer difficult, the problem is you can not let them in the running time they get results!

Packet : 33753168castle.rar filelist
castle
castle\1794 -- Castle Walls.files
castle\1794 -- Castle Walls.files\goback.jpg
castle\1794 -- Castle Walls.files\home.jpg
castle\1794 -- Castle Walls.files\login.htm
castle\1794 -- Castle Walls.files\logo.jpg
castle\1794 -- Castle Walls.files\table_back.jpg
castle\1794 -- Castle Walls.files\top.jpg
castle\1794 -- Castle Walls.htm
castle\castle_wall
castle\castle_wall\castle_wall.jcw
castle\castle_wall\castle_walls.class
castle\castle_wall\castle_walls.java

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