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难道真的要算上一开始站在树2的情况？？？？用记忆化搜索和动态规划都做了一下，在Discuss有人提出的样例也都过了，WA到怀疑人生，结果算上一开始在树2的情况就AC了，为什么 ？？？？？？？ Followed by:
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