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感觉BFS不好做啊我这样想的：如果某个时候竖起方块，将某一个点占了，但是最后找不到目标节点。然后另外一次需要横放在这上面，但是其中有一个已经被标记了，就不做了。弄得找不到结果。 看来我的想法有待改进 Followed by:
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