摘要：Description There are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can connect to each oth 阅读全文

摘要：Economic times these days are tough, even in Byteland. To reduce the operating costs, the government of Byteland has decided to optimize the road ligh 阅读全文

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摘要：某省调查乡村交通状况，得到的统计表中列出了任意两村庄间的距离。省政府“畅通工程”的目标是使全省任何两个村庄间都可以实现公路交通（但不一定有直接的公路相连，只要能间接通过公路可达即可），并要求铺设的公路总长度为最小。请计算最小的公路总长度。 Input测试输入包含若干测试用例。每个测试用例的第1行给出 阅读全文