More Problems

• Create a function that checks if a string is a valid password (contains uppercase, lowercase, digits, and special characters) using hashing.
• Implement a function to return the first unique character in a string using a hash map.
• Write a program to find the maximum length of a subarray with distinct elements using hashing.
• Create a function that returns the number of distinct characters in a string using a hash set.
• Given a list of names, write a function to find the names that appear more than once using hashing.
• Write a program to check if the characters in a string can form a palindrome using a hash map.
• Create a function to find the frequency of the first character in a string using hashing.
• Implement a program to return the characters that do not appear in another string using hashing.