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compression.pdf
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compression.pdf
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Squeezing Ten Pounds of Data in a Five Pound Sack
- or -
The Compression Problem
Computational Thinking
In this discussion, we will look at the compression problem.
Along the way, we will see several examples of computational thinking:
• representations allow the computer to store and work with letters, images,
or music by representing them with a numeric code;
• patterns or repeated strings in text can be used by a computer for compres-
sion;
• index tables allow us to replace a long idea with a short word or number;
Reading assignment
Read Chapter 7, pages 105–121, “9 Algorithms that Changed the Future”.
The Compression Problem for Traveling
When you pack for a trip, you want to minimize the number of suitcases and bags
you take, but maximize the things you can transport. Sometimes it takes several
repackings, rolling and squashing and rearranging, before you are satisfied.
The Compression Problem for File Storage
Your computer hard disk has a limited amount of storage. The information in
a single movie or song could easily fill up your entire computer memory. This
doesn’t happen because the information is compressed in several ways.
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