import java.util.Arrays;
public class GFG
{
public static void mergeSort(int[] array)
{
if(array == null)
{
return;
}
if(array.length > 1)
{
int mid = array.length / 2;
int[] left = new int[mid];
for(int i = 0; i < mid; i++)
{
left[i] = array[i];
}
int[] right = new int[array.length - mid];
for(int i = mid; i < array.length; i++)
{
right[i - mid] = array[i];
}
mergeSort(left);
mergeSort(right);
int i = 0;
int j = 0;
int k = 0;
while(i < left.length && j < right.length)
{
if(left[i] < right[j])
{
array[k] = left[i];
i++;
}
else
{
array[k] = right[j];
j++;
}
k++;
}
while(i < left.length)
{
array[k] = left[i];
i++;
k++;
}
while(j < right.length)
{
array[k] = right[j];
j++;
k++;
}
}
}
public static void main(String[] args)
{
int arr[] = {12, 11, 13, 5, 6, 7};
int i=0;
System.out.println("Given array is");
for(i=0; i<arr.length; i++)
System.out.print(arr[i]+" ");
mergeSort(arr);
System.out.println("\n");
System.out.println("Sorted array is");
for(i=0; i<arr.length; i++)
System.out.print(arr[i]+" ");
}
}