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Tutorial 4 Linked List, Stack, & Queue

Tutorial 4 Linked List, Stack, & Queue. Linked List: Revision. Done Last Week…. The concept of ADT List ADT List using Array Pro & cons  Discussed in T02Q3 and today in Q1! ADT List using Linked List Basic idea: Slide 17 Linked List Node has 2 parts: Item/Value/Content  See T03Sup1&2

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Tutorial 4 Linked List, Stack, & Queue

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  1. Tutorial 4Linked List, Stack, & Queue

  2. Linked List: Revision Done Last Week… • The concept of ADT List • ADT List using Array • Pro & cons  Discussed in T02Q3and today in Q1! • ADT List using Linked List • Basic idea: Slide 17 • Linked List Node has 2 parts: • Item/Value/Content  See T03Sup1&2 • Pointers to immediate neighbors • Single Linked List • The basic; traversal: head to tail • Usually: insert from head ( Stack) • In your lecture notes: BasicLinkList (Slide 26-28), ExtendedLinkedList (Slide 29-36) • Generic Java (Slide 37-46) for our custom Basic and Extended LinkedList • Linked List Variations: • Linked List with Tail Pointer • Can visit the tail very fast  • Cannot delete the tail easily…  • In lecture notes (Slide 48-53): TailedLinkedList(revisited in Queue data structure later) • Bidirectional Linked List • Two pointers: forward/backward • Can go backwards, Can delete tail!  • Extra pointer is overhead  • In lecture notes (Slide 54-58):DoublyLinkedList • Circular Linked List • Remember Tail only, Head = Tail.Next • Can visit all node from any node . • Good for Round Robin stuffs • Generic LinkedList<E> (slide 61-66) for a “bug-free”, “ready-to-use” LL 

  3. Student Presentation • T3 • KohXianghua, Nicholas • N/A • Sean Lim Wei Xinq • T4 • Tan MiangYeow (Done Last Week) • N/A • Chua Kien Chuan Chris • T5 • N/A • N/A • N/A • T6 • Kuganeswari D/O Kuhanesan • Chow Jian Ann • Chow Jian Ann This week marks the end of this bidding system… Some students have not participate at all!

  4. Question 1 (MovieDataAnalysis) • Insert New Item (Movie ADT) to LinkedList • Ensure that you check for duplicate data!

  5. Question 2 (MovieDataAnalysis) • Given time period (yearA – yearB) • Get movies that are produced within that range. • Methods • 1: Scan and select the appropriate movies • 2: Copy the list and delete movies that are out of range • What if we use Doubly Linked List? • Pro and Cons? 2008 2007 2007 2008 2006

  6. Question 3 (MovieDataAnalysis) • Given two TopList containing movies, perform: • Intersection • Union • Difference • Remember that A-B is not the same as B-A! Person A’s preference: Person B’s preference:

  7. Tutorial 5 Preview

  8. Stack • Stack: Last In First Out (LIFO) • Stack Implemented using Array with top pointer • http://www2.latech.edu/~box/ds/Stack/Stack.html • Best Implementation? • Using Single Link List with head pointer, demo: • http://www.cosc.canterbury.ac.nz/people/mukundan/dsal/LinkListAppl.html

  9. Queue • First In First Out (FIFO) • Queue implemented as Circular Array • http://maven.smith.edu/~streinu/Teaching/Courses/112/Applets/Queue/myApplet.html • Queue implemented as Single Link List with Tail Pointer • Head pointer for dequeue • Tail pointer for enqueue • We reverse their rolebecause of the pointer directions • Best Implementation? • Use Circular Single Link List • Save one more pointer as head = tail.next…

  10. Student Presentation • T3 Main Backup • CaiJingfangChngJiajie • Li HuanNurLiyanaBteRoslie • Zhang Jianfei Tan Kar Ann • Tanvir Islam Jessica Chin ZetSze • T4 Main Backup • Choy QianNing, J LiewHui Sun • GohKhoonHiang Li Yawen • HanyenknoAfi Tan Peck Luan • Ng Xue Lin Sherilyn Wong Suet Teng, Melissa • T5 Main Backup • JoyeetaBiswasOngKian An • TeoSim Yee Stephanie Tan Yan Hao • Wu Shujun Wang Ruohan • Liu Na Zheng Yang • T6 Main Backup • Zhang Chao Wang Shuling • Chua Yu Tong LauraRasheillaBte Rajah • Koh Yi Ting Brenda Low Wei Chen Gerard J • Siddhartha GanZhi Wei James Since some students still have not tried at allTherefore, I have to assign 4 random students to do tutorial 5(Please just treat this as mid-test preparation, you have 1 week recess!)

  11. Question 1 (Applications) • Show us 7 applications of Stacks • Show us 7 applications of Queues

  12. Question 2 (Stack: Reorder) • Algorithm to reorder items using one stack! • Requires thinking on Stack operations: push, pop, top/seek • Hint: Try the sample input-output manually! • Derive patterns and write your algorithm!

  13. Question 3 (Stack for Sorting) • Find algorithm to sort items using two stacks! • Requires thinking on Stack operations: push, pop, top/seek • Hint: try sorting these simple numbers using two stacks: • {7, 5}  {5, 7} • {1, 5, 3}  {1, 3, 5} • {4, 3, 2, 1}  {1, 2, 3, 4} • Derive patterns and write your algorithm!

  14. Question 4 (Queue) • What if Queue ADT is implemented using TailedLinkedListbut in different way! • Think about the pros and cons of this strategy!

  15. Next Week (Recess) • Use your recess week carefully! • CS1102 midterm test is just RecessWeek.getNext()! • For those who are assigned to do Tutorial 5, you have 1 week buffer! • Recess != holiday!! • However >.< • I will be taking my holiday leave… • Going back to Jakarta 19-25 Sep 08 • You can email me but my response will be slower…

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