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Help!为什么我在做第二问的时候如果判断条件是
if(scc==1)printf("0\n");就AC，scc为求强连通后的缩成的点数
if(in==1&&out==1)printf("0\n");就Wa //in，out分别为缩点后DAG中的入度为0的个数，出度为0的个数
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