Topic: hashing-problem / Level: intermediate

• 1201. Write a function to find the first unique character in a string using a hash map.
• 1202. Given a string, implement a function to count the total number of unique letters using hashing.
• 1203. Create a program that checks if a list contains any pairs of integers that are equal using a hash set.
• 1204. Write a function to find the total number of vowels in a string using a hash map.
• 1205. Implement a function to find the maximum frequency of any element in a list using a hash map.
• 1206. Create a program to check if two strings are isomorphic using a hash map.
• 1207. Write a function to find the longest palindrome substring in a given string using hashing.
• 1208. Given a string, write a program to find all unique characters using a hash set.
• 1209. Implement a function to check if a string is a valid email address using hashing.
• 1210. Create a program to find the frequency of elements in a list using a hash map.
• 1211. Write a function to find the first non-repeating character in a string using a hash table.
• 1212. Given two strings, implement a function to check if they are equal when case is ignored using hashing.
• 1213. Create a program to find the first character that occurs more than twice in a string using hashing.
• 1214. Write a function to count the occurrences of a specific character in a string using a hash map.
• 1215. Implement a function to find the maximum frequency of any digit in a number using a hash map.
• 1216. Create a program that checks if two strings can be rearranged to form a valid word using hashing.
• 1217. Write a function to find the longest substring that contains at most k distinct characters using hashing.
• 1218. Given an array, write a program to find the total number of even numbers using hashing.
• 1219. Implement a function to count the total number of consonants in a string using a hash map.
• 1220. Create a program to check if a string can be transformed into a palindrome using hashing.
• 1221. Write a function to find the maximum product of two distinct elements in an array using hashing.
• 1222. Given a string, write a program to find all substrings that are palindromes using hashing.
• 1223. Implement a function to count the frequency of each letter in the English alphabet in a string using a hash map.
• 1224. Create a program to find the total number of unique words in a paragraph using hashing.
• 1225. Write a function to determine if a list contains any pairs of integers that are equal using a hash set.
• 1226. Implement a function to find the first non-repeating character in a list of strings using hashing.
• 1227. Create a program to find the longest substring that contains only digits using hashing.
• 1228. Write a function to check if two strings can be rearranged to form a valid palindrome using hashing.
• 1229. Given a string, write a program to find the longest substring of unique characters using hashing.
• 1230. Create a function that checks if a list of integers contains any duplicates using a hash set.
• 1231. Write a program to count the number of unique characters in a string using a hash set.
• 1232. Implement a function to find the longest substring that is a palindrome using hashing.
• 1233. Create a program to check if a string can be transformed into another string using a hash map.
• 1234. Write a function to find the longest consecutive sequence of numbers in an array using hashing.
• 1235. Given a string, write a program to count the total number of unique letters using hashing.
• 1236. Implement a function to find the first character that appears twice in a string using a hash map.
• 1237. Create a program that checks if two strings can be made identical by swapping characters using hashing.
• 1238. Write a function to find the longest substring with exactly one repeating character using hashing.
• 1239. Given an array of integers, write a program to find the count of elements that are unique using hashing.
• 1240. Implement a function to count the number of occurrences of a specific word in a sentence using a hash map.
• 1241. Create a program to find the longest substring that is an anagram of another substring using hashing.
• 1242. Write a function to check if a string contains all the letters of the alphabet using hashing.
• 1243. Given a string, write a program to find the first non-repeating character using a hash map.
• 1244. Implement a function to find the total number of characters in a string excluding spaces using hashing.
• 1245. Create a program to check if two strings are isomorphic using hashing.
• 1246. Write a function to find the frequency of elements in a list using a hash map.
• 1247. Given a string, implement a function to count the total number of unique letters using hashing.
• 1248. Create a program that checks if a list contains any duplicates using a hash set.
• 1249. Write a function to find the longest substring with exactly two distinct characters using hashing.
• 1250. Implement a function to count the frequency of each letter in the English alphabet in a string using a hash map.

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