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CSE331 HW4

# CSE331 HW4 - might be two kinds of edges i.e it might be...

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CSE 331: Introduction to Algorithm Analysis and Design Fall 2011 Homework 4 Due Friday, October 7, 2011 by 1:15pm in class IMPORTANT: Please submit each problem separately, i.e. each problem should begin on a new page and only the pages for one problem should be stapled together. Failure to do so might result in some problem(s) not being graded. For general homework policies and our suggestions, please see the policy document. Do NOT submit the last problem. It will not be graded. However, we highly encourage you to think about the problem to get more comfortable with graphs. 1. (40 points ) Exercise 2 in Chapter 3. 2. (45 points ) Exercise 4 in Chapter 3. ( Hint : It might be useful to represent the input as a graph and run one of the connectivity algorithms we have seen in class. Also in one way of representing the “relationships,” there
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Unformatted text preview: might be two kinds of edges: i.e., it might be useful to “label” the edges. As usual, feel free to ignore this hint and come up with an algorithm from scratch.) 3. (15 points ) Exercise 8 in Chapter 3. 4. ( Do NOT turn this problem in ) Given a directed graph G = ( V,E ), a vertex s ∈ V is called a sink if there are incoming edges from every other vertex to s but no outgoing edge from s , i.e. |{ ( u,s ) ∈ E }| = | V | -1 and |{ ( s,u ) ∈ E }| = 0. • As a warmup present an O ( n 2 ) algorithm to ﬁnd out if G has a sink and if so, to output it. (Recall that n = | V | ). • Now present an O ( n ) time algorithm for the same problem. 1...
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