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Chapter 3 The Efficiency of Algorithms. Figure 3.3 A Choice of Algorithms.

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Presentation on theme: "Chapter 3 The Efficiency of Algorithms. Figure 3.3 A Choice of Algorithms."— Presentation transcript:

1 Chapter 3 The Efficiency of Algorithms

2 Figure 3.3 A Choice of Algorithms

3 Figure 3.3.1 The Shuffle-Left Algorithm – Original Configuration

4 Figure 3.3.1 The Shuffle-Left Algorithm – The Value of Legit- First Copy

5 Figure 3.3.1 The Shuffle-Left Algorithm – The Value of Legit – Second Copy

6 Figure 3.3.1 The Shuffle-Left Algorithm – The Value of Legit – The Third Copy

7 Figure 3.3.1 The Shuffle-Left Algorithm- The Value of Legit – After Last Item is Copied, the Result is This

8 Figure 3.3.1 The Shuffle-Left Algorithm – The Value of Legit – Reset the Right Hand Finger to Start Again

9 Figure 3.3.1 – The Shuffle-Left Algorithm – The Value of Legit – Left and Right Hand Finger Move Forward

10 Figure 3.3.1 – The Shuffle Left Algorithm – The Value of Legit – Moving along, we pass over the 16.

11 Figure 3.3.1 The Shuffle-Left Algorithm – The Value of Legit-Seven Copies squeeze out O

12 Figure 3.3.1 The Shuffle-Left Algorithm – The Value of Legit - The 36, 42, 23, and 21 Are Passed Over; This is the Result

13 Figure 3.3.1 The Shuffle-Left Algorithm – The Value of Legit – Squeezing out Final 0 Gives This Result

14 Figure 3.3.1 – The Shuffle Left Algorithm – The Value of Legit – The Left Hand Finger is Pointing At a Nonzero Element, so Another Advance of Both Fingers Gives Us This Configuration.

15 Figure 3.3.2 The Copy-Over Algorithm

16 Figure 3.3.3 The Converging-Pointers Algorithm – The Value of Legit

17 Figure 3.3.3 The Converging-Pointers Algorithm – The Value of Legit – Legit and Right Are Reduced by 1.

18 Figure 3.3.3 The Converging-Pointers Algorithm – The Value of Legit – The Value of Left Increases

19 Figure 3.3.3 The Converging-Pointers Algorithm – The Value of Legit – Position Right is Copied Into Position Left

20 Figure 3.3.3 The Converging-Pointers Algorithm – The Value of Legit –Item at Position Left is Still 0, Another Copy Takes Place

21 Practice Problems - In the Data Cleanup Problem, Suppose the Original Data Is Like This

22 Figure 3.6 Values of Magnitude – Work = 2n

23 Figure 3.7 Order of Magnitude - Work = cn for Various Values of c

24 Figure 3.8 – Order of Magnitude – Growth of Work = cn for Various Values of c

25 Figure 3.9 Order of Magnitude -Table of Calling Information

26 Figure 3.10 –Order of Magnitude – Work = cn 2 for Various Values c

27 Figure 3.11 The 0rder of Magnitude – A Comparison of n and n 2

28 Figure 3.12 – Order of Magnitude – For Large Enough n, 0.25n 2 Has Larger Values than 10n

29 Figure 3.13 Order of Magnitude – A Comparison of Two Extreme Θ (n 2 ) and Θ (n) Algorithms

30 Using the Information in Figure 3.5 Fill in the Above Table for the Number of Comparisons required in the Sequential Search Algorithm

31 Figure 3.14 Analysis of Algorithms – Analysis of Three Data Cleanup Algorithms

32 Figure 3.16 Selection Sort Algorithms – Comparisons Required by Selection Sort

33 Figure 3.17 –Selection Sort Algorithms - An Attempt to Exchange the Values at X and Y

34 Figure 3.18 Selection Sort Algorithms – Exchanging the Values of X and Y

35 Figure 3.21 Binary Search – Values of n and lg n

36 Figure 3.22 Binary Search – A comparison of n and lg n

37 Figure 3.23 Summary – Order-of-Magnitude Time Efficiency Summary

38 Figure 3.24 When Things Get Out of Hand – Four Connected Cities

39 Figure 3.25 When Things Get Out of Hand – Hamiltonian Circuits Among All Paths from A in Figure 3.24 with Four Links

40 Figure 3.26 (a) When Things Get Out of Hand – Comparisons of lg n, n, n 2, and 2 n

41 Figure 3.26 (b) When Things Get Out of Hand – Comparisons of lg n,n, n 2, and 2 n

42 Figure 3.28 Approximation Problems – A First-Fit Solution to a Bin-Packing Problem

43 Practice Problems – Tree Shows All Paths with Two Links That Begin At Node A

44 Exercises – Write the Data List that Results from running the Shuffle-Left Algorithm to clean up this Data

45 Exercises – A Linked List

46 Exercises Draw a Linked List when Data Cleanup is Performed on This Linked List


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