Linked Lists

1. Linked Lists Mohammed Almashat CS 561 26/03/2006

2. Outline • Introduction • Insertion Description • Deletion Description • Basic Node Implementation • Conclusion

3. Outline • Introduction • Insertion Description • Deletion Description • Basic Node Implementation • Conclusion

4. Introduction • Definitions • Lists and arrays • Nodes and pointers • Single Linked Lists • Double Linked Lists • Circular Lists • Advantages

5. Introduction • Definitions • Lists and arrays • Nodes and pointers • Single Linked Lists • Double Linked Lists • Circular Lists • Advantages

6. Lists and arrays • Lists:

7. Lists and arrays • Arrays: {Size of the following array is = 4}

8. Introduction • Definitions • Lists and arrays • Nodes and pointers • Single Linked Lists • Double Linked Lists • Circular Lists • Advantages

9. Nodes and pointers

10. Introduction • Definitions • Lists and arrays • Nodes and pointers • Single Linked Lists • Double Linked Lists • Circular Lists • Advantages

11. Single linked lists

12. Introduction • Definitions • Lists and arrays • Nodes and pointers • Single Linked Lists • Double Linked Lists • Circular Lists • Advantages

13. Double Linked Lists

14. Introduction • Definitions • Lists and arrays • Nodes and pointers • Single Linked Lists • Double Linked Lists • Circular Lists • Advantages

15. Circular Lists

16. Introduction • Definitions • Lists and arrays • Nodes and pointers • Single Linked Lists • Double Linked Lists • Circular Lists • Advantages

17. Advantages The Linked List advantages are collected because of the array disadvantages, array disadvantages are: • Array Size • Memory allocation • Insertion and Deletion

18. Outline • Introduction • Insertion Description • Deletion Description • Basic Node Implementation • Conclusion

19. Insertion Description • Insertion at the top of the list • Insertion at the end of the list • Insertion in the middle of the list

20. Insertion Description • Insertion at the top of the list • Insertion at the end of the list • Insertion in the middle of the list

21. Insertion at the top Steps: • Create a Node • Set the node data Values • Connect the pointers

22. head 93 // head 48 17 142 Insertion Description • Follow the previous steps and we get Step 1 Step 2 Step 3

23. Insertion Description • Insertion at the top of the list • Insertion at the end of the list • Insertion in the middle of the list

24. Insertion at the end Steps: • Create a Node • Set the node data Values • Connect the pointers

25. // head 48 17 142 Insertion Description • Follow the previous steps and we get Step 1 Step 2 Step 3

26. Insertion Description • Insertion at the top of the list • Insertion at the end of the list • Insertion in the middle of the list

27. Insertion in the middle Steps: • Create a Node • Set the node data Values • Break pointer connection • Re-connect the pointers

28. Insertion Description Step 1 Step 2 Step 3 Step 4

29. Outline • Introduction • Insertion Description • Deletion Description • Basic Node Implementation • Conclusion

30. Deletion Description • Deleting from the top of the list • Deleting from the end of the list • Deleting from the middle of the list

31. Deletion Description • Deleting from the top of the list • Deleting from the end of the list • Deleting from the middle of the list

32. Deleting from the top Steps • Break the pointer connection • Re-connect the nodes • Delete the node

33. 6 6 42 42 42 Deletion Description head 4 17 head 4 17 head 4 17

34. Deletion Description • Deleting from the top of the list • Deleting from the end of the list • Deleting from the middle of the list

35. Deleting from the end Steps • Break the pointer connection • Set previous node pointer to NULL • Delete the node

36. 6 6 6 42 42 Deletion Description head 4 17 head 4 17 head 4 17

37. Deletion Description • Deleting from the top of the list • Deleting from the end of the list • Deleting from the middle of the list

38. Deleting from the Middle Steps • Set previous Node pointer to next node • Break Node pointer connection • Delete the node

39. 42 42 42 Deletion Description head 4 17 head 4 17 head 4

40. Outline • Introduction • Insertion Description • Deletion Description • Basic Node Implementation • Conclusion

41. Basic Node Implementation The following code is written in C++: Struct Node { int data; //any type of data could be another struct Node *next; //this is an important piece of code “pointer” };

42. Outline • Introduction • Insertion Description • Deletion Description • Basic Node Implementation • Conclusion