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经测试，此题数据有2个问题1、有不连通的图，但是如果在程序中判断联通性，不连通的图算找不到就会WA，不连通的图需要找最大的联通部分才能AC。 2、No junction connects more than 44 streets.这句话不成立。部分数据有单个路口连接超过100街道的情况，我把路口度的上限设成2000才AC，具体要多少也懒的测试了 Followed by:
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