CSE373: Data Structures & Algorithms - Exam Preparation and Course Wrap-up, Lecture notes of Design

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CSE373: Data Structures & Algorithms

Lecture 23: Course Victory Lap

Kevin Quinn

Fall 2015

Today

• Rest-of-course logistics: exam, etc.
• Review of main course themes
• Course evaluations
  • Thoughtful and constructive feedback deeply appreciated
  • (Including what you liked) 2

• Sorting
• Minimum Spanning Trees
• Parallelism And Concurrency
• Problem Solving
• Perserving Abstractions

Post Midterm Topics

• Properties and runtimes of varying sorting algorithms
  • How much extra space required? In place?
  • Partially sorted? Reverse order?
  • Homework 6 is great to help prepare
• Given a following block mystery psuedocode, determine which sorting algorithm it is
• Non-comparison based sorts (bucket sort and radix sort)

Sorting

• What is the difference?
• Maps and Reductions
  • Map : Applying a function to all of the values in a collection, resulting in a identical length collection. - Map([1,2,3,4,5,6], +1) = [2,3,4,5,6,7]
  • Reduction : Applying a function to a collection to reduce it to a single value. - Reduce([1,2,3,4,5,6], leftmost even number) = 2
• Work : How long it takes 1 processor to execute a sequentially execute a block of code
• Span : how long it takes infinite processors to execute a block of code

Parallelism and Concurrency

7

• Copy in vs. Copy out
  • To protect internal structures from being modified by clients
• Private and Final fields
  • How do they impact immutability?
• Hiding unnecessary information from Clients
  • For example : A client generally does not need to know that your Disjoint sets are being represented as Uptrees
  • Another example : Java’s HashTable does not tell you what hashcode they are using. Why?

Preserving Abstraction

Victory Lap

A victory lap is an extra trip around the track

• By the exhausted victors (that’s us) J Review course goals
• Slides from Lecture 1
• What makes CSE373 special

Thank you!

Big thank-you to your TAs: Rocne Hunter Hunter 2. Bessie Rahul Johnson Eden Megan Mauricio Andy!

Now three slides, completely unedited, from Lecture 1

• Hopefully they make more sense now
• Hopefully we succeeded

Data Structures

• Introduction to Algorithm Analysis
• Lists, Stacks, Queues
• Trees, Hashing, Dictionaries
• Heaps, Priority Queues
• Sorting
• Disjoint Sets
• Graph Algorithms
• May have time for other brief exposure to topics, maybe parallelism

Goals

• Be able to make good design choices as a developer, project manager, etc. - Reason in terms of the general abstractions that come up in all non-trivial software (and many non-software) systems
• Be able to justify and communicate your design decisions Kevin’s take:
  • Key abstractions used almost every day in just about anything related to computing and software
  • It is a vocabulary you are likely to internalize permanently

Hopefully cse373 will not be your last exposure to computer science. There are lots of other awesome computer science courses for non-cse majors!

• CSE 154: Web Programming
  • Developing Websites and client and server side software
• CSE 374: Intermediate programming Concepts and Tools
  • Concepts of lower-level programming (C/C++) and explicit memory management
• CSE 417: Algorithms and Computational Complexity
  • NP Complete problems, undecidable problems, graph theory and complexity
• CSE 415: Introduction to Artificial Intelligence
  • Knowledge representation, logical and probabilistic reasoning, learning, language understanding, intro to game theory

Where next?

• Haskell : http://learnyouahaskell.com/chapters
• C++ : http://www.learncpp.com/
• Scala : http://www.scala-lang.org/documentation/
• Ruby : https://www.codecademy.com/learn/ruby
• PHP : https://www.codecademy.com/learn/php
• Racket : https://learnxinyminutes.com/docs/racket/
• There are resources of 100’s of languages online. Pick one and mess with it!

Learn a new Language!

• Using Unity : https://www.udemy.com/unitycourse/
• Using ActionScript : https://www.siteground.com/tutorials/actionscript/
• Make an Android App (using mostly Java): http://developer.android.com/training/basics/firstapp/index.html

Learn to code games!