More Problems

• 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.
• Implement a function to check if a string can be rearranged into a palindrome using hashing.
• Create a program to count the total number of digits in a string using a hash map.
• Write a function to find the number of unique triplets in an array that sum to zero using hashing.
• Given a string, write a program to determine the frequency of each letter using hashing.