lab_09 - The algorithm runs in phases, one phase for each...

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Lab Tasks 9 No submission. 1. Download the assignment project from http://www.comp.nus.edu.sg/ cs1102s/java/Lab9.zip . Complete the class sorting.BubbleSort.java to implement the following sorting algorithm: Input: Unsorted array a of size n Algorithm: Complete n - 1 passes. In each pass k , run through the ele- ments at position 1 to n - k , comparing the element with its neighbor to the right. If they are in the wrong order, swap them. Optimization: Terminate the whole sorting if you complete a pass that leads to no swap. What is the best-case and worst case complexity of bubble sort? 2. Complete the class sorting.ShellHibbard.java to implement Shellsort using Hibbard’s increments. 3. Complete the class sorting.RadixSort.java to implement the following sorting algorithm called radix sort . You can assume that the objects to be sorted are strings whose characters are upper-case letters from ’A’ to ’Z’, such as HELLO.
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Unformatted text preview: The algorithm runs in phases, one phase for each position in the given strings, starting from the least signiFcant character. In each phase, the strings are sorted into groups according to the position under consider-ation. It is important to make sure that the ordering with respect to a phase is not disturbed in subsequent phases. 1 The algorithm in more detail: radixSort(theArray: array of strings) identify the size n of theArray and the longest string size d for (j = d down to 1) { Initialize 26 groups to empty Initialize a counter for each group to 0 for (i = 0 through n - 1) { k = j-th letter of theArray[i] Place theArray[i] at the end of group k Increase k-th counter by 1 } Replace the strings in theArray with all the strings in group 0, followed by the strings in group 1, and so on } What is the worst-case complexity of radix sort? 2...
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This note was uploaded on 06/09/2011 for the course CS 11025 taught by Professor Nil during the Spring '11 term at National University of Singapore.

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lab_09 - The algorithm runs in phases, one phase for each...

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