# HW1 - CS 521 Data Structures and Algorithms 1 Fall...

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CS 521: Data Structures and Algorithms 1 Fall 2009-2010 Homework 1 1. (20 Pts) Rank the following functions by order of growth; that is, find an arrangement g 1 , g 2 , . . . , g 25 of the functions satisfying g 1 = Ω( g 2 ) , g 2 = Ω( g 3 ) , ..., g 24 = Ω( g 25 ). Partition your list into equiva- lence classes such that f ( n ) and g ( n ) are in the same class if and only if f ( n ) = θ ( g ( n )): (3 / 2) n ( 2) log n log * n n 2 (log n )! n 3 log 2 n log n ! 2 2 n n 1 / log n log log n n. 2 n n log log n ln n 2 n 2 log n (log n ) log n 4 log n ( n + 1)! log n n ! 2 2 log n n n log n n 100 2. (20 Pts) Compute the running time of the following algorithms (justify your answers). We may assume multiplication and computing sqrt(n) takes constant time. (a) Algorithm veryodd(n) for i= 1 to n if odd(i) then begin for j=i to n do x<--x+1 for j=1 to i do y<--y+1 endif endfor end algorithm ______________________________________ (b) Algorithm what(n) for i= 1 to floor( sqrt(n) ) do for j= floor( sqrt(n) ) downto 1 do for= 1 to j do O(1)-time sequence of statements endfor endfor endfor endalgorithm ______________________________________ (c) Algorithm complex(n) for i= 1 to n do j=1 while (j < n) do

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