「卓見杯」第五屆CCPC中國大學生程序設計競賽河南省賽網絡賽 D Defending Plan Support（樹形dp，貢獻值，遞推）

題目描述node The architectural structure of the college is strange, but the rule is that there is only one simple path between every two classrooms. Now the battle between Class A and Class F broke out. A

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