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Fortressproblem
- 一个自己输入的n*n的正方形格子,其中有的地方有堡垒(不能通过),求从一点到另外一点至少需要多少步?-Input their own n* n square lattice, which in some places there is a fortress (can not), and from one point to another point at least the number of step-by-step?