More Problems

• Write a function to find the first character that occurs more than twice in a string using a hash map.
• Given two strings, write a program to find the longest common substring using a hash table.
• Implement a function to check if a string contains a specific sequence of characters using hashing.
• Create a program to find the frequency of elements in a list using a hash map.
• Write a function to find the longest substring with at most k distinct characters using hashing.
• Given a string, write a program to count the number of unique letters using hashing.
• Create a function that checks if a list of integers contains any duplicates using a hash set.
• Write a program to find the maximum length of a substring that contains only lowercase letters using hashing.