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hw8 - CS 473 Algorithms Fall 2010 HW 8(due Tuesday November...

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CS 473: Algorithms, Fall 2010 HW 8 (due Tuesday, November 2) This homework contains four problems. Read the instructions for submitting homework on the course webpage . In particular, make sure that you write the solutions for the problems on separate sheets of paper; the sheets for each problem should be stapled together. Write your name and netid on each sheet. Collaboration Policy: For this home work, Problems 1-3 can be worked in groups of up to 3 students each. Problem 0 should be answered in Compass as part of the assessment HW8-Online and should be done individually. 0. (10 pts) HW8-Online on Compass. 1. (35 pts) Suppose we want to write an efficient function Shuffle( n ) that returns a permutation of the set { 1 , 2 , ..., n } chosen uniformly at random. (a) Prove that the following algorithm is not correct.[Hint: Consider n = 3.] Algorithm Shuffle ( n ) 1. for i 1 to n 2. do π [ i ] i 3. for i 1 to n 4. do swap π [ i ] π [Random( n )] 5. return π [1 . . . n ] (b) Prove that the following implementation of Shuffle( n ) is correct. What is its expected
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