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# 图
有向图，无向图。
# 临界表
二维数组表示图
# 拓扑图
有向无环图
1. 列出二维表
2. 找出每个点的入度
3. 取出入度为0的节点，作为当前位置，多个并列排序
4. 将取出节点到达节点的入度减1.
5. 循环3，4.