CS61B, 2021 Note: This lecture was lecture 34 in Spring 2019! The online video will have the wrong lecture number as a result. Lecture 31: Software Engineering II ¡ñ Teamwork ¡ñ Cast Study in Complexity: Build Your Own World ¡ñ Modular Design datastructur.es Build Your Own World datastructur.es Build Your Own World In the previous […]
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Announcements We are now in Phase 3 of the course Algorithms and Software Engineering. Lectures in this phase: ¡ñ Algorithms. ¡ñ 3 software engineering lectures (we already did #1). Optional textbook for software engineering lectures: ¡°A Philosophy of Software Design¡± by John Ousterhout. datastructur.es Announcements Phase 3 of the course starts today: Algorithms and Software
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CS61B, 2019 Lecture 16: ADTs and BSTs ● Abstract Data Types ● Binary Search Tree (intro) ● BST Definitions ● BST Operations ● Sets vs. Maps, Summary datastructur.es Abstract Data Types datastructur.es Interfaces vs. Implementation In class: ● Developed ALists and SLLists. ● Created an interface List61B. ○ Modified AList and SLList to implement List61B.
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CS61B Lectures 38: Compression ● Prefix Free Codes ● Huffman Coding ● Theory of Compression ● LZW (Extra) ● Lossy Compression (Extra) Zip Files, How Do They Work? $ zip mobydick.zip mobydick.txt adding: mobydick.txt (deflated 59%) $ ls -l -rw-rw-r– 1 jug jug 643207 Apr 24 10:55 mobydick.txt -rw-rw-r– 1 jug jug 261375 Apr 24
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CS61B, 2021 Lecture 21: Graphs and Traversals ¡ñ Tree Traversals ¡ñ Graphs ¡ñ Depth First Search ¡ñ Breadth First Search datastructur.es Trees and Traversals datastructur.es Tree Definition (Reminder) A tree consists of: ¡ñ A set of nodes. ¡ñ A set of edges that connect those nodes. ¡ð Constraint: There is exactly one path between any
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Note This lecture is the last lecture in scope for Spring 2021 midterm 2. datastructur.es CS61B, 2021 Lecture 22: Graphs II: Graph Traversal Implementations ¡ñ BreadthFirstPaths ¡ñ Graph API ¡ñ Graph Representations and Graph Algorithm Runtimes ¡ñ Graph Traversal Runtimes ¡ñ Layers of Abstraction Tree and Graph Traversals Just as there are many tree traversals:
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Practice Test 1 Which of the following statements is false? a. A subclass is generally larger than its superclass. b. A superclass object is a subclass object. c. The class following the extends keyword in a class declaration is the direct superclass of the class being declared. d. Java uses interfaces to provide the benefits
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CS61B Lecture 36: The End of Sorting ¡ñ An Intuitive, Analytical, and Empirical look at Radix vs. Comparison Sorting ¡ñ The Just-In-Time Compiler ¡ñ Radix Sorting Integers ¡ñ Summary datastructur.es Intuitive: Radix Sort vs. Comparison Sorting datastructur.es Merge Sort Runtime yellkey.com/wall Merge Sort requires ¦¨(N log N) compares. What is Merge Sort¡¯s runtime on strings
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UC Berkeley – Computer Science CS61B: Data Structures Final, Fall 2020 This test has 9 questions across 18 pages worth a total of 1600 points and is to be completed in 170 minutes. The exam is closed book, except that you are allowed to use two double sided written cheat sheets (front and back). No
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Implements vs. Extends On Monday, a student asked after class ¡°how do you know whether to use implements or extends?¡± Somehow I didn¡¯t explicitly mention the difference between ¡°implements¡± and ¡°extends¡± during lecture. ¡ñ You must use ¡°implements¡± if the hyperym is an interface and the hyponym is a class (e.g. hypernym List, hyponym AList).
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