Homework 2
			due Mon., Jan. 31
			(hardcopy only, handwritten is fine)

Please note that some of these exercises depend on the book's
description of DFS (depth-first search) with previsit and postvisit
orderings.  This is covered in sections 3.2.2 to 3.2.4.  You are responsible
for reading and understanding everything through the end of Section 3.3
for this exercise --- including any topics not discussed in class.
    Next week, I will review sections 3.2.2 through 3.2.4 and 
resume lecturing starting at section 3.4.

The homework #2 is from Chapter 3.  Exercises:
  3.5, 3.6, 3.7(a), 3.8, 3.11, 3.13, 3.16