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这题输入数据有坑！！！发现官方数据有很多节点不是按顺序给的！！！比如 10 -1 N 7 N 6 N 1 N 6 N 1 Y 4 Y 7 N 6 N 4 N 0 有一条数据居然是这样的，如果不是看了官方数据，WA到死都找不到原因 Followed by:
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