多分类支持向量机实现方法的分析比较：一对一、一对多和DAG的对比，比较专业，-more SVM method of comparison : one-to-one, one-to-many and DAG contrast, more professional-huh

给定DAG图，用Java求其关键路径,DAG图的输入接口还不带完善，目前需要手工在main函数中改，可以通过界面输入。-this applet can give out the key path of a DAG graph, but the interface of inputing is not quite good.

实现一个有向无环图的拓扑排序并且把它输出来(Implement a topological sort that has an acyclic graph and lose it)