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Interview Question

Software QA Engineer Intern Interview San Francisco, CA

Was asked to program quick-sort in Java.

java, sorting algorithm

Interview Answer

1 Answer


void QuickSort(int[] arr, int low, int high)
     while (low < high)
         int pivot = (low+high)/2;
         int partition = Partition(arr, low, high, pivot);
         QuickSort(arr, low, partition);
         QuickSort(arr, partition+1, high);

 void Partition(int[] arr, int low, int high, int pivot)
     // take pivot element to end
     swap(arr[pivot], arr[high]);

     int pivotElement = arr[high];
     int finalPosition = 0;

     for (int i = low; i < high - 1; ++i)
         if (arr[i] < pivotElement)

     // put pivot element in its "final position"

Jigargosha on 10 Jul 2012

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