1. Write a program to find the second largest element in an array.

2. Write a program to find the second smallest element in an array.

3. Write a program to find the frequency of elements in an array.

4. Write a program to remove duplicates from an array.

5. Write a program to merge two arrays.

6. Write a program to sort an array in ascending order.

7. Write a program to sort an array in descending order.

8. Write a program to search an element in an array using linear search.

9. Write a program to search an element in an array using binary search.

10. Write a program to find the transpose of a matrix.

11. Write a program to find the sum of two matrices.

12. Write a program to find the difference of two matrices.

13. Write a program to find the product of two matrices.

14. Write a program to find the trace of a matrix.

15. Write a program to find the determinant of a matrix.

16. Write a program to check if a matrix is symmetric.

17. Write a program to check if a matrix is skew-symmetric.

18. Write a program to check if a matrix is an identity matrix.

19. Write a program to check if a matrix is a diagonal matrix.

20. Write a program to check if a matrix is an upper triangular matrix.

21. Write a program to check if a matrix is a lower triangular matrix.

22. Write a program to find the sum of the main diagonal elements of a matrix.

23. Write a program to find the sum of the secondary diagonal elements of a matrix.

24. Write a program to print the boundary elements of a matrix.

25. Write a program to print the spiral order of a matrix.

26. Write a program to find the length of a linked list.

27. Write a program to reverse a linked list.

28. Write a program to find the middle element of a linked list.

29. Write a program to find the nth node from the end of a linked list.

30. Write a program to check if a linked list is a palindrome.

31. Write a program to remove duplicates from a linked list.

32. Write a program to merge two sorted linked lists.

33. Write a program to find the intersection point of two linked lists.

34. Write a program to detect a cycle in a linked list.

35. Write a program to remove a cycle from a linked list.

36. Write a program to implement a stack using an array.

37. Write a program to implement a stack using a linked list.

38. Write a program to implement a queue using an array.

39. Write a program to implement a queue using a linked list.

40. Write a program to implement a circular queue.

41. Write a program to implement a priority queue.

42. Write a program to find the infix to postfix conversion.

43. Write a program to evaluate a postfix expression.

44. Write a program to find the infix to prefix conversion.

45. Write a program to evaluate a prefix expression.

46. Write a program to implement a binary search tree.

47. Write a program to find the height of a binary search tree.

48. Write a program to find the minimum and maximum element in a binary search tree.

49. Write a program to find the inorder, preorder, and postorder traversal of a binary search tree.

50. Write a program to find the level order traversal of a binary search tree.