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益智問答 (求解)

Jan 28th 2015, 13:58

在河裡並排著七顆浮出水面的石頭，其中左邊三顆石頭分別有三隻青蛙臥著，最右邊三顆石頭也有三隻青蛙臥著，他們的方向剛好相反。每隻青蛙都不想落水，而且每顆石頭只夠一隻青蛙立足。每隻青蛙的跳動只能依照下列規則進行：
(1)青蛙只能站在原地或往前跳，不允許向後跳。
(2)青蛙可以跳到前一顆石頭，或者越過前一顆石頭到達下一顆石頭。

請問這六隻青蛙該如何跳動，才能讓左邊的三隻青蛙與右邊的三隻青蛙剛好互換？

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