Binary Insertion sort is a variant of Insertion sorting with binary s…

…earch.

sorting/binary_insertion_sort.c

@@ -0,0 +1,62 @@
+/*
+Binary Insertion sort is a variant of Insertion sorting in which proper location to insert the selected element is found using the binary search.
+*/
+
+#include<stdio.h>
+
+int binarySearch(int a[], int item, int low, int high)
+{
+    if (high <= low)
+        return (item > a[low])?  (low + 1): low;
+
+    int mid = (low + high)/2;
+
+    if(item == a[mid])
+        return mid+1;
+
+    if(item > a[mid])
+        return binarySearch(a, item, mid+1, high);
+    return binarySearch(a, item, low, mid-1);
+}
+
+// Function to sort an array a[] of size 'n'
+void insertionSort(int a[], int n)
+{
+    int i, loc, j, k, selected;
+
+    for (i = 1; i < n; ++i)
+    {
+        j = i - 1;
+        selected = a[i];
+
+        // find location where selected sould be inseretd
+        loc = binarySearch(a, selected, 0, j);
+
+        // Move all elements after location to create space
+        while (j >= loc)
+        {
+            a[j+1] = a[j];
+            j--;
+        }
+        a[j+1] = selected;
+    }
+}
+
+int main()
+{
+    int n;
+    scanf("%d",&n) ;
+    int a[n],i;
+    for(i = 0; i<n; i++)
+    {
+	scanf("%d",&a[i]);
+    }
+
+    insertionSort(a, n);
+
+    printf("Sorted array: \n");
+    for (i = 0; i < n; i++)
+        printf("%d ",a[i]);
+
+    return 0;
+}