Topic: Hashing-question / Level: Intermediate

• 231. Write a program to find the length of the longest substring with the same character occurring at least k times using hashing.
• 232. Implement a function to find all unique characters in a string using hashing.
• 233. Create a hash table to store the IDs and prices of products in an online store.
• 234. Write a program to find the most frequently occurring element in an array using hashing.
• 235. Implement a function to check if a given set of parentheses is valid using a hash set.
• 236. Create a hash map to track the number of times a character appears in a string.
• 237. Write a program to find the longest substring that contains only digits using hashing.
• 238. Implement a function to check if two strings are isomorphic using hashing.
• 239. Create a hash table to store timestamps and their corresponding event names.
• 240. Write a program to find all subsets of a set using hashing.
• 241. Implement a function to find the longest consecutive elements sequence in an unsorted array using hashing.
• 242. Create a hash map to track the number of unique products sold on an e-commerce platform.
• 243. Write a program to determine if there is a valid path in a grid using hashing.
• 244. Implement a function to find the longest substring that starts and ends with the same character using hashing.
• 245. Create a hash table to store URLs and their corresponding page titles.
• 246. Write a program to find the longest substring that is a palindrome using hashing.
• 247. Implement a function to check if a given array can form a palindrome using hashing.
• 248. Create a hash map to track the number of students enrolled in different courses.
• 249. Write a program to find the unique numbers in an array using hashing.
• 250. Implement a function to check if a string can be formed from a dictionary of words using hashing.
• 251. Create a hash table to store the mapping of state names to their capitals.
• 252. Write a program to find the longest subsequence of increasing numbers in an array using hashing.
• 253. Implement a function to find all duplicates in an array using hashing.
• 254. Create a hash map to track the number of likes on different social media posts.
• 255. Write a program to find the longest substring that contains at most two repeating characters using hashing.
• 256. Implement a function to determine if two strings can be made equal by rearranging their characters using hashing.
• 257. Create a hash table to store the scores of different teams in a sports league.
• 258. Write a program to check if a string is a valid number using hashing.
• 259. Implement a function to find the longest substring of vowels in a given string using hashing.
• 260. Create a hash map to track the total revenue generated by different products.

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