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from Volume 2. Data Structures :: Graphs
要逃离一个三维的立方体地牢。输入地牢的三维图像，有起点有逃脱点，输出能否逃离地牢，能逃离地牢则要输出最短逃离时间。
三维的 BFS ，在常用的二维BFS中增加一维即可。