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这么想对不对

Posted by foreverlin at 2009-03-13 16:11:15 on Problem 3207
//首先读入数据,保存每一条边,如果有两边交叉,那么组合起来是四种
//将原来的边,看做点连起来放入到新的图中,显然这个图是对称的
//比如线段1和2交,设总共有m条线段,那么他的对立面分别是1+m,2+m

//然后对这个新的图求强连通,如果点i和i+m在同一强连通那么是不行的

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