小時候看過一本從日本翻譯過來的"奇妙的數學遊戲", 裡面有介紹一個圓形的費城迷宮,從出發處到目的地有640種走法. 沒看過中文網頁有介紹,英文網頁介紹可參見: (這是1本書,1917) http://www.gutenberg.org/files/16713/16713-h/16713-h.htm 我嘗試在BBS上畫出,簡化的費城迷宮(simplified Philadelphia maze). ┌────────────────┐┌───────────────┐ │┌──────────────┐││──────────────┐│ ││┌────────────┐│││─────────────┐││ │││┌───────────││││────────────┐│││ ││││┌──────────││││───────────┐││││ │││││┌─────────│││└──────────┐│││││ ││││││┌────────││├──────────┐││││││ │││││││┌───────┘││┌────────┐│││││││ ││││││││┌───────┘││┌──────┐││││││││ │││││││││┌───────┤││─────┐│││││││││ ││││││││││┌─────┐│││────┐││││││││││ │││││││││││┌────││││───┐│││││││││││ ││││││││││││┌───││││──┐││││││││││││ │││││││││││││┌──│││└─┐│││││││││││││ ││││││││││││││┌─││└─┐││││││││││││││ │││││││││││││││┌┘└─┐│││││││││││││││ ││││││││││││││││ ││││││││││││││││ ││││││││││││││││ ││││││││││││││││ ││││││││││││││││ ││││││││││││││││ │││││││││││││││└───┘│││││││││││││││ ││││││││││││││└─────┘││││││││││││││ │││││││││││││└───────┘│││││││││││││ ││││││││││││└─────────┘││││││││││││ │││││││││││└───────────┘│││││││││││ ││││││││││└─────────────┘││││││││││ │││││││││└───────────────┘│││││││││ ││││││││└─────────────────┘││││││││ │││││││└───────────────────┘│││││││ ││││││└─────────────────────┘││││││ │││││└───────────────────────┘│││││ ││││└─────────────────────────┘││││ │││└───────────────────────────┘│││ ││└─────────────────────────────┘││ │└───────────────────────────────┘│ └─────────────────────────────────┘ +---------------------------------+ +-------------------------------+ | +-----------------------------+ | | ----------------------------+ | | | +-------------------------+ | | | --------------------------+ | | | | | +---------------------- | | | | ------------------------+ | | | | | | | +-------------------- | | | | ----------------------+ | | | | | | | | | +------------------ | | | +---------------------+ | | | | | | | | | | | +---------------- | | +---------------------+ | | | | | | | | | | | | | +---------------+ | | +-----------------+ | | | | | | | | | | | | | | | +---------------+ | | +-------------+ | | | | | | | | | | | | | | | | | +---------------+ | | ----------+ | | | | | | | | | | | | | | | | | | | +-----------+ | | | --------+ | | | | | | | | | | | | | | | | | | | | | +-------- | | | | ------+ | | | | | | | | | | | | | | | | | | | | | | | +------ | | | | ----+ | | | | | | | | | | | | | | | | | | | | | | | | | +---- | | | +---+ | | | | | | | | | | | | | | | | | | | | | | | | | | | +-- | | +---+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +-+ +---+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +-------+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +-----------+ | | | | | | | | | | | | | | | | | | | | | | | | | | | +---------------+ | | | | | | | | | | | | | | | | | | | | | | | | | + ------------------+ | | | | | | | | | | | | | | | | | | | | | | | +-----------------------+ | | | | | | | | | | | | | | | | | | | | | +---------------------------+ | | | | | | | | | | | | | | | | | | | +-------------------------------+ | | | | | | | | | | | | | | | | | +-----------------------------------+ | | | | | | | | | | | | | | | +---------------------------------------+ | | | | | | | | | | | | | +-------------------------------------------+ | | | | | | | | | | | +-----------------------------------------------+ | | | | | | | | | +---------------------------------------------------+ | | | | | | | +-------------------------------------------------------+ | | | | | +-----------------------------------------------------------+ | | | +---------------------------------------------------------------+ | +-------------------------------------------------------------------+ ※ 編輯: Stopper 來自: 61.56.4.195 (11/03 19:20)