AP计算机教程11-8：中等多选题

Which of the following correctly shows the iterations of an ascending (from left to right) insertion sort on an array with the following elements: {7,3,8,5,2}?

What is printed when the following main method is executed?

public class Searcher
{
    private int[] arr = {1,3,5,8,9};

    public int mystery(int low, int high, int num)
    {
        int mid = (low + high) / 2;
        if (low > high) {
            return -1;   }
        else if (arr[mid] < num) {
            return mystery(mid + 1, high, num);   }
        else if (arr[mid] > num) {
            return mystery(low, mid - 1, num);   }
        else
            return mid;
    }

    public static void main(String[] args)
    {
        Searcher s = new Searcher();
        System.out.println(s.mystery(0,4,3));
    }
}

Which of the following correctly shows the iterations of an ascending (from left to right) selection sort on an array with the following elements: {10, 6, 3, 2, 8}?

Which of the following could be used to replace /* missing code */ in the code so that the method always sorts the array elem in ascending order?

public class Searcher
{

    public static void sort(int[] elem)
    {
        for (int j = 0; j < elem.length - 1; j++)
        {
            int minIndex = j;

            for (/* missing code */)
            {
                if (elem [k] < elem [minIndex])
                {
                    minIndex = k;
                }
            }
            int temp = elem[j];
            elem[j] = elem[minIndex];
            elem[minIndex] = temp;
        }
    }

    public static void main(String[] args)
    {
        int[] nums = {28, -3, 2, 14, 30};
        Searcher.sort(nums);
    }
}