'Variable length code' presentation slideshows

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Optimization Problems

Optimization Problems. Optimization problem: a problem of finding the best solution from all feasible solutions. Two common techniques: Greedy Algorithms (local) Dynamic Programming (global). Greedy Algorithms. Greedy algorithms typically consist of A set of candidate solutions

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Greedy Algorithms

Greedy Algorithms. Amihood Amir Bar-Ilan University. Idea. Simplest type of strategy: 1. Take a step that makes the problem smaller. 2. iterate. Difficulty: Prove that this leads to an optimal solution. This is not always the case!. Example: Centerstring Problem.

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15-853:Algorithms in the Real World

15-853:Algorithms in the Real World. Data Compression: Lectures 1 and 2. Compression in the Real World. Generic File Compression Files : gzip (LZ77), bzip (Burrows-Wheeler), BOA (PPM) Archivers : ARC (LZW), PKZip (LZW+) File systems : NTFS Communication

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Analysis of Algorithms CS 477/677

Analysis of Algorithms CS 477/677. Instructor: Monica Nicolescu Lecture 25. Final Exam. Monday, May 12, 10:15am-12: 15pm in AB 106 Exam structure: TRUE/FALSE questions short questions on the topics discussed in class homework-like problems

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SIMS-201

SIMS-201. Compressing Information. Overview. Chapter 7: Compression Introduction Entropy Huffman coding Universal coding. Introduction. World Wide Web not World Wide Wait.

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Huffman Codes

Huffman Codes. Information coding: Most info transmission machines (computer terminal, Voyager spacecraft) use a binary code. Why? These electric signals are either present or absent at any specific time. Suppose Voyager on-board camera is sensitive to four shades of gray: White Light gray

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