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字典序？建树时从小枚举，用$Dijkstra$的血泪建好树，$size$大小决定贡献 阅读全文
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城为物，人为容，价值？排序后，一切都明了 cpp include include include include include include define R(a,b,c) for(register int a = (b); a = (c); a) define Fill(a,b) memset 阅读全文