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有向图
邻接表法、邻接矩阵法描述图
图（Graph）包含点（Node）和边（Edge）。
### 宽度优先遍历
按照分支一个一个走，栈弹出一个打印一次，Set登记表记录哪些走过。
### 深度优先遍历
深度优先遍历，入栈打印
拓扑序，点数大的小。