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呵呵,这是我的第一个并查集,发帖庆贺一下受first 启发,我把找祖先的循环该成递归函数,并去掉最后一个搜索祖先的循环,一下子就AC了,不过还是没有first的程序快,我的慢了200ms，人家是牛人呀。。。 Followed by:
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