161. Implement a function to check if two strings are anagrams using sorting and hashing.
162. Create a hash table to store employee IDs and their corresponding salaries.
163. Write a program to find the longest substring with an equal number of 0s and 1s using hashing.
164. Implement a function to find the first unique element in an array using hashing.
165. Create a hash map to track the number of shares for different social media posts.
166. Write a program to find the maximum length of a contiguous subarray with at most two distinct elements using hashing.
167. Implement a function to check if a string is a valid shuffle of two other strings using hashing.
168. Create a hash table to store student IDs and their corresponding GPAs.
169. Write a program to find the smallest substring containing all characters of a given string using hashing.
170. Implement a function to count the number of distinct substrings in a string using hashing.
171. Create a hash map to track the number of clicks on different links in a document.
172. Write a program to find the longest substring that contains the same character repeated at least k times using hashing.
173. Implement a function to find all unique words in a sentence using hashing.
174. Create a hash table to store product names and their corresponding prices.
175. Write a program to find the longest sequence of consecutive numbers in an array using hashing.
176. Implement a function to check if a string can be formed by concatenating substrings of another string using hashing.
177. Create a hash map to track the number of orders placed by different customers.
178. Write a program to find the maximum frequency of any character in a string using hashing.
179. Implement a function to find all pairs in an array that sum to a target using hashing.
180. Create a hash table to store song titles and their corresponding artists.
181. Write a program to find the longest substring that contains only digits using hashing.
182. Implement a function to check if a string has balanced brackets using hashing.
183. Create a hash map to track the number of upvotes for different posts.
184. Write a program to find the longest substring of vowels in a given string using hashing.
185. Implement a function to count the number of distinct characters in a string using hashing.
186. Create a hash table to store the mapping of country names to their capitals.
187. Write a program to check if a string is a valid palindrome, considering only alphanumeric characters using hashing.
188. Implement a function to find the maximum length of a subarray with an equal number of 0s and 1s using hashing.
189. Create a hash map to track the number of likes on different social media posts.
190. Write a program to find all pairs of elements in an array whose product equals a target value using hashing.
191. Implement a function to check if a string is a valid anagram of another using hashing.
192. Create a hash table to store event names and their corresponding dates.
193. Write a program to find the first character that appears twice in a string using hashing.
194. Implement a function to count the number of unique elements in an array using hashing.
195. Create a hash map to track the number of times a word appears in a document.
196. Write a program to find the longest substring that is a palindrome using hashing.
197. Implement a function to check if two strings are isomorphic using hashing.
198. Create a hash table to store user IDs and their corresponding profile information.
199. Write a program to find the common elements between two lists using hashing.
200. Implement a function to check if a string contains valid parentheses using a hash set.