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请问这题应该怎么剪枝？我每次从大到小取棍子，然后优先扩展减少距离的两个方向，遇到交叉线就剪掉，遇到剩下的棍子长度不够连接的也剪掉，还是TLE，还有什么剪枝的地方吗？thanks Followed by:
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