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如何创建下面的图表与graphviz的C语言库:Graphviz的节点排名编程
digraph G {
{rank=same; n1, n2}
n1 -> n2 -> n3;
}
下面的线条都清晰:
g = agopen("G", AGFLAG_DIRECTED);
agnode(g, "n1");
agnode(g, "n2");
agnode(g, "n3");
agedge(g, "n1", "n2");
agedge(g, "n2", "n3");
如何排名n1和n2?