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不能再wa了，高人提示一下吧， 我考虑了以下情况我用邻接表所以重边可以不用管 v==0或v==1的时候输出 0 有(a,a)这种边存在的时候不把它插入到邻接表中忽略， 用unsigned __64来存储数据 但是还是wa还有什么trick吗？ 高人指点一下吧 Followed by:
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