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终于AC了,搞了好久,一开始用卡鲁斯卡而超时,后来改用先缩点再连接表的prime,WA了,然后就无限WA,后来看到printed without rounding to two decimal places,以为是不用四舍五入,又WA,后来才发现自己的min定义成了int形了。真是区折啊,一道水题搞了这么久。Followed by:
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