这是拓扑排序的两种算法的对比，其中一个需要判断环结构算法过于复杂，但提出了另一个思路有兴趣的同学可以改一改，如果成功了请联系我，另一个是标准答案。-This is a comparison of the two topological sorting algorithm, one needs to determine the ring structure algorithm is too complex, but another idea Interested students can modi