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正确的办法是用优先队列不是队列如果用队列，碰巧有些方向顺序可以过，但是优先队列不需要，需要注意的一点是将队头pop出来之后再去改vis=1，不是push 的时候就让vis=1，否则如果有更少的segment，无法加到队列中。 Followed by:
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