More Problems

• Given a string, write a program to find the longest substring of unique characters using hashing.
• Create a function that checks if a list of integers contains any duplicates using a hash set.
• Write a program to count the number of unique characters in a string using a hash set.
• Implement a function to find the longest substring that is a palindrome using hashing.
• Create a program to check if a string can be transformed into another string using a hash map.
• Write a function to find the longest consecutive sequence of numbers in an array using hashing.
• Given a string, write a program to count the total number of unique letters using hashing.
• Implement a function to find the first character that appears twice in a string using a hash map.