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Java Program for Binary Insertion Sort

  • Last Updated : 28 Jun, 2021

We can use binary search to reduce the number of comparisons in normal insertion sort. Binary Insertion Sort find use binary search to find the proper location to insert the selected item at each iteration.
In normal insertion, sort it takes O(i) (at ith iteration) in worst case. we can reduce it to O(logi) by using binary search.

Java




// Java Program implementing
// binary insertion sort
  
import java.util.Arrays;
class GFG
{
    public static void main(String[] args)
    {
        final int[] arr = {37, 23, 0, 17, 12, 72, 31,
                             46, 100, 88, 54 };
  
        new GFG().sort(arr);
  
        for(int i=0; i<arr.length; i++)
            System.out.print(arr[i]+" ");
    }
  
    public void sort(int array[])
    {
        for (int i = 1; i < array.length; i++)
        {
            int x = array[i];
  
            // Find location to insert using binary search
            int j = Math.abs(Arrays.binarySearch(array, 0, i, x) + 1);
  
            //Shifting array to one location right
            System.arraycopy(array, j, array, j+1, i-j);
  
            //Placing element at its correct location
            array[j] = x;
        }
    }
}
  
// Code contributed by Mohit Gupta_OMG 

Please refer complete article on Binary Insertion Sort for more details!

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