41. Write a function that finds the kth smallest element in a binary search tree.
42. Create an algorithm to find the first non-repeating character in a string.
43. Implement a function to find the longest repeating character replacement.
44. Write a program that searches for a specific item in a warehouse inventory system.
45. Create a function to find the maximum sum of non-adjacent elements in an array.
46. Implement an algorithm to search for a string in a case-insensitive manner.
47. Write a program to find the smallest element in a sorted and rotated array.
48. Create a function to find the longest substring that is a palindrome.
49. Implement an algorithm to search for a number in a circularly sorted array.
50. Write a program that finds the number of pairs with a given sum in an array.
51. Create a function that counts the frequency of each element in an array.
52. Implement a program to search for the longest common subsequence in two strings.
53. Write a function that finds all the unique elements in an array.
54. Create an algorithm to find the shortest path in a weighted graph using binary search.
55. Implement a function to search for a value in a binary search tree (BST).
56. Write a program to find the smallest and largest element in a binary search tree.
57. Create a function that finds the longest subsequence with a specific difference.
58. Implement an algorithm to search for an element in a doubly linked list.
59. Write a program to find the longest increasing path in a matrix.
60. Create a function that checks if a list of numbers contains a valid sequence.
61. Implement a program to search for the first occurrence of a character in a string.
62. Write a function that counts how many times a target appears in a sorted array.
63. Create an algorithm to find the longest chain of pairs in an array.
64. Implement a function to check if two strings are anagrams of each other using sorting.
65. Write a program that finds the intersection of two linked lists.
66. Create a function that searches for the longest valid parentheses substring.
67. Implement an algorithm to find the maximum number in a sliding window.
68. Write a program that checks if a sequence can be partitioned into subsets with equal sums.
69. Create a function that finds the longest substring of digits in a string.
70. Implement a program to search for the first occurrence of a pattern in a string.
71. Write a function that checks if a number is a power of two using binary search.
72. Create an algorithm to find the longest contiguous subarray with a sum equal to k.
73. Implement a function that finds the total number of unique paths in a grid.
74. Write a program that checks if a list of intervals can be merged.
75. Create a function that finds the first missing positive integer in an unsorted array.
76. Implement an algorithm to search for the largest sum contiguous subarray.
77. Write a program that finds all subsets of a given set.
78. Create a function that counts the number of unique elements in two sorted arrays.
79. Implement a program to search for a specific item in a retail store inventory.
80. Write a function that finds the longest alternating subsequence in an array.