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Unformatted text preview: UC Berkeley—CS 170 Midterm 1 Lecturer: Michael Jordan September 30 Midterm 1 for CS 170 Print your name: , (last) (first) Sign your name: Write your section number (e.g., 101): Write your SID: One page of notes is permitted. No electronic devices, e.g. cell phones and calculators, are permitted. Do all your work on the pages of this examination. If you need more space, you may use the reverse side of the page, but try to use the reverse of the same page where the problem is stated. You have 50 minutes. The questions are of varying diﬃculty, so avoid spending too long on any one question. In all algorithm design problems, you may use highlevel pseudocode. DO NOT TURN THE PAGE UNTIL YOU ARE TOLD TO DO SO. Problem Score/Points 1 /12 2 /20 3 /17 4 /10 5 /10 6 /10 7 /10 8 /15 Total /104 Date: September 30 2 1. True/False [2 points per problem] For each statement below, say whether it is true or false by circling True or False . You do not need to provide any explanation for your answer. (a) True or False : The topological sort of an arbitrary acylic directed graph can be computed in linear time. (b) True or False : Consider an edge ( u, v ) in a directed graph. In a depthfirst search of this graph, if u has ( pre , post ) times equal to (6,9) and v has ( pre , post ) times equal to (5,10) then ( u, v ) must be a back edge. (c) True or False : In a depthfirst search of a directed graph, it is possible to have an edge between two vertices u and v with ( pre , post ) times equal to (5,10) for...
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This document was uploaded on 02/27/2010.
 Spring '09

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