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可能不都联通，这样方程可能就是奇异的了

Posted by kicc at 2005-09-04 23:13:38 on Problem 1926
In Reply To:什么trick？ Posted by:tdzl2003 at 2005-09-04 19:46:03 
很多牛队就是没有想到这个，用消元的方法，结果比赛的时候错了无数次
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