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贡献一组数据。切换灯的时候。如果频率一样。永远都ab点永远不能到达。

Posted by 274856653 at 2019-09-06 17:15:41 on Problem 1158
1 2
4 1
P 1 2 2
B 1 2 2
P 2 87 4 
P 38 96 49
1 2 4

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