Lec15LinkedStructures_2per.pdf

Lec15LinkedStructures_2per.pdf - The University Of Michigan...

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1 The University Of Michigan Andrew M. Morgan EECS402 Lecture 15 Savitch Ch. 17 Linked Data Structures EECS 402 EECS 402 Andrew M Morgan 2 Sorted Arrays As Lists Arrays are used to store a list of values Arrays are contained in contiguous memory Recall inserting a new element in the middle of an array requires later elements to be "shifted". For large lists of values, this is inefficient. void insertSorted(int value, int &length, int list[]) { int i = length - 1; while (list[i] > value) { list[i + 1] = list[i]; i--; } list[i + 1] = value; length++; } Shifting array elements that come after the element being inserted 4 8 13 29 37 4 6 8 13 29 37 Insert 6
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2 EECS 402 EECS 402 Andrew M Morgan 3 Sorted Arrays, Cot'd Due to the need to "shift" elements, sorted arrays are: Inefficient when inserting into the middle or front Inefficient when deleting from the middle or front Efficient for searching Since inserting and deleting are common operations, we need to find a data structure which allows more efficiency Contiguous memory will not work will always require a shift "Random" placement requires "random" memory locations Dynamic allocation provides "random" locations, and means that the list can grow as much as necessary The maximum size need not be known ever This is not true for arrays, even dynamically allocated arrays EECS 402 EECS 402 Andrew M Morgan 4 Intro To Linked Lists A linked list is a data structure which allows efficient insertion and deletion. Consists of "nodes". Each node contains: A value - the data being stored in the list A pointer to another (the next) node By carefully keeping pointers accurate, you can start at the first node, and follow pointers through entire list.
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