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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<time.h>
  4. int count=0;
  5. void merge(int a[], int low,int mid,int high)
  6. {
  7. int i,j,k,c[10000];
  8. i=low, j=mid+1, k=0;
  9. while((i<=mid) && (j<=high))
  10. {
  11. count++;
  12. //choose the least element and store in Temporary array 'C'
  13. if(a[i]<a[j])
  14. c[k++]=a[i++];
  15. else
  16. c[k++]=a[j++];
  17. }
  18. //Copy the remaining array elements from any one of sub-array
  19. while(i<=mid)
  20. c[k++]=a[i++];
  21. while(j<=high)
  22. c[k++]=a[j++];
  23. for(i=low,j=0;j<k;i++, j++)
  24. a[i]=c[j];
  25. }
  26. void merge_sort(int a[], int low, int high)
  27. {
  28. int mid;
  29. if(low < high)
  30. {
  31. //Divide the given array into 2 parts
  32. mid=(low+high)/2;
  33. merge_sort(a,low,mid);
  34. merge_sort(a,mid+1,high);
  35. merge(a,low,mid,high);
  36. }
  37. }
  38. int main()
  39.  
  40. {
  41. int a[100],n,i;
  42. printf("Enter the number of elements in an array:");
  43. scanf("%d",&n);
  44. printf("All the elements:");
  45. srand(time(0));
  46. for(i=0;i<n;i++)
  47. {
  48. a[i]=rand();
  49. printf("%d ",a[i]);
  50. }
  51. merge_sort(a,0,n-1);
  52. printf("\nAfter sorting\n");
  53. for(i=0;i<n;i++)
  54. printf("%d ", a[i]);
  55. printf("\nNumber of basic operations = %d\n",count);
  56. }
Success #stdin #stdout 0s 5324KB
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stdin
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4
543 54 67 533
stdout
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Enter the number of elements in an array:All the elements:2030520192 1982829749 909813154 1749296074 
After sorting
909813154 1749296074 1982829749 2030520192 
Number of basic operations = 4
https://ideone.com/6p8vq8
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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