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Design and Analysis Of Algorithms

Published on Nov 06, 2015


An algorithm is just the outline or idea behind a program. We express algorithms in pseudo-code: something resembling C or Pascal, but with some statements in English rather than within the programming language. It is expected that one could translate each pseudo-code statement to a small number of lines of actual code, easily and mechanically.

This class covers the design of algorithms for various types of problems, as well as a mathematical analysis of those algorithms done independently of any actual computational experiments. The purpose of design of algorithms is obvious: one needs an algorithm in order to write a program. Analysis of algorithms is less obviously necessary, but has several purposes:

a) Analysis can be more reliable than experimentation. If we experiment, we only know the behavior of a program on certain specific test cases, while analysis can give us guarantees about the performance on all inputs.

b) It helps one choose among different solutions to problems. As we will see, there can be many different solutions to the same problem. A careful analysis and comparison can help us decide which one would be the best for our purpose, without requiring that all be implemented and tested.

c) We can predict the performance of a program before we take the time to write code. In a large project, if we waited until after all the code was written to discover that something runs very slowly, it could be a major disaster, but if we do the analysis first we have time to discover speed problems and work around them.

d) By analyzing an algorithm, we gain a better understanding of where the fast and slow parts are, and what to work on or work around in order to speed it up.

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