Topic: Hashing-question / Level: Intermediate

• 201. Write a function to find the first non-repeating character in a string using hashing.
• 202. Implement a program to check if two strings are anagrams using a hash map.
• 203. Create a hash table to store user profiles and implement a function to retrieve a profile by user ID.
• 204. Write a program to count the frequency of each character in a given string using hashing.
• 205. Implement a function to find the longest substring without repeating characters using hashing.
• 206. Create a hash map to keep track of student IDs and their corresponding grades.
• 207. Write a program to find all pairs in an array that sum up to a specific target using hashing.
• 208. Implement a function to check if a list contains duplicates using a hash set.
• 209. Create a hash table to store product IDs and their prices and implement a function to get the price of a product.
• 210. Write a program to group anagrams from a list of strings using hashing.
• 211. Implement a function to find the longest consecutive sequence of numbers in an array using a hash map.
• 212. Create a hash map to store employee IDs and their corresponding department names.
• 213. Write a program to find the intersection of two arrays using hashing.
• 214. Implement a function to check if a string can be formed by rearranging another string using hashing.
• 215. Create a hash table to track the number of occurrences of words in a text document.
• 216. Write a program to find the smallest substring containing all characters of a given string using hashing.
• 217. Implement a function to find the number of unique elements in an array using a hash set.
• 218. Create a hash map to store the mapping of country names to their capitals.
• 219. Write a program to find the first repeating character in a string using hashing.
• 220. Implement a function to determine if two strings are permutations of each other using a hash map.
• 221. Create a hash table to keep track of book titles and their corresponding authors.
• 222. Write a program to find the longest substring with at most k distinct characters using hashing.
• 223. Implement a function to check if a string contains all unique characters using a hash set.
• 224. Create a hash map to track the number of votes for different candidates in an election.
• 225. Write a program to find the maximum occurring character in a string using hashing.
• 226. Implement a function to check if a string is a palindrome using a hash map.
• 227. Create a hash table to store the scores of different players in a game.
• 228. Write a program to find the longest prefix that is common among an array of strings using hashing.
• 229. Implement a function to determine if there are two numbers in an array that multiply to a specific target using hashing.
• 230. Create a hash map to track the number of items sold for different products.

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