More Problems

• Create a program to check if a string can be rearranged to form a valid word using hashing.
• Write a function to find the maximum frequency of any character in a string using a hash map.
• Given a string, write a program to count the total number of unique letters using hashing.
• Implement a function to find the first unique character in a string using a hash map.
• Create a program that checks if two strings can be rearranged to form a palindrome using hashing.
• Write a function to find the longest substring with at most k distinct characters using hashing.
• Given an array, write a program to count the number of unique triplets that sum to zero using hashing.
• Implement a function to check if a string is a valid email address using hashing.