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Thread: Sorting arrays using a recursive binary search

  1. #1
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    Default Sorting arrays using a recursive binary search

    How would I use a recursive binary search to sort a list of unsorted numbers e.g.

     5 29 17 3 6 43

    My code for the recursive binary search is....

        public static int bSearch(int[] a, int lo, int hi, int key)
    	    {
    		    int mid = (lo+hi)/2;
    		    if(lo>hi)
    		        return -1;
    		    else if (a[mid]==key)
    		        return mid;
    		    else if (a[mid]<key)
    		        return bSearch(a, mid+1, hi, key);
    		    else
    		        return bSearch(a, lo, mid-1, key);
    	    }

    My insert in order method would be....
        static void insertInOrder( int[] arr, int cnt, int newVal )  
         {
          int index = -( bSearch( arr, 0, arr.length-1, newVal)) - 1;
           //Stuck here ********************
         }


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    Default Re: Sorting arrays using a recursive binary search

    Welcome to the forum! Thanks for taking the time to learn how to post code correctly.

  3. #3
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    Default Re: Sorting arrays using a recursive binary search

    recursive binary search
    does it mean that you are not allowed to use a loop? maybe it is an assignment, i guess.

    My insert in order method would be....
    do you really need another method for interchanging the values?

    do you know how to sort an array using loop with nested loop?
    i think it is called a bubble sort.
    I think it would be easier to explain how to do that if you at least understand how to create a bubble sort program.

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