More Problems

• Write a function to determine if a list contains any pairs of integers that are equal using a hash set.
• Implement a function to find the first non-repeating character in a list of strings using hashing.
• Create a program to find the longest substring that contains only digits using hashing.
• Write a function to check if two strings can be rearranged to form a valid palindrome using hashing.
• 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.