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COS 226 Exercises on Digraphs

**1. **
Give the order in which DFS *first* visits each vertex in the following
digraph. This is called the *preorder*.
(Iterate through the neighbors of v in increasing order.)

preorder 0
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**2. **
Give the order in which DFS *finishes* visiting each vertex in the following
DAG. This is called the *postorder*.
(Iterate through the neighbors of v in increasing order.)

postorder 0
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**3. **
Use the postorder from the previous question to topologically sort the DAG.

topological order 0
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