图是长方形棋盘网格从A沿着各县走到B的最短路线共有多少条
A---1---1---1---11---1---1---1---11---1---1---1---11---1---1---1---B(图中1为竖线)...
A---1---1---1---1
1---1---1---1---1
1---1---1---1---1
1---1---1---1---B
(图中1为竖线) 展开
1---1---1---1---1
1---1---1---1---1
1---1---1---1---B
(图中1为竖线) 展开
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