content: public class MergeSort {
      // Merge two subarrays of arr[].
      // First subarray is arr[l..m]
      // Second subarray is arr[m+1..r]
      public static void merge(int arr[], int l, int m, int r) {
          int n1 = m - l + 1;
          int n2 = r - m;
  
          // Create temporary arrays
          int L[] = new int[n1];
          int R[] = new int[n2];
  
          // Copy data to temporary arrays L[] and R[]
          for (int i = 0; i < n1; i++)
              L[i] = arr[l + i];
          for (int j = 0; j < n2; j++)
              R[j] = arr[m + 1 + j];
  
          // Merge the temporary arrays
          int i = 0, j = 0;
          int k = l;
  
          // Merging back into arr[l..r]
          while (i < n1 && j < n2) {
              if (L[i] <= R[j]) {
                  arr[k] = L[i];
                  i++;
              } else {
                  arr[k] = R[j];
                  j++;
              }
              k++;
          }
  
          // Copy the remaining elements of L[], if any
          while (i < n1) {
              arr[k] = L[i];
              i++;
              k++;
          }
  
          // Copy the remaining elements of R[], if any
          while (j < n2) {
              arr[k] = R[j];
              j++;
              k++;
          }
      }
  
      // Main function that sorts arr[l..r] using merge()
      public static void sort(int arr[], int l, int r) {
          if (l < r) {
              // Find the middle point
              int m = l + (r - l) / 2;
  
              // Recursively sort first and second halves
              sort(arr, l, m);
              sort(arr, m + 1, r);
  
              // Merge the sorted halves
              merge(arr, l, m, r);
          }
      }
  
      public static void main(String args[]) {
          int arr[] = {12, 11, 13, 5, 6, 7};
  
          // Calling the sort function
          sort(arr, 0, arr.length - 1);
  
          // Print sorted array
          System.out.println("Sorted array:");
          for (int num : arr) {
              System.out.print(num + " ");
          }
      }
  }
  