More Problems

• Given a string, implement a function to count the total number of unique letters using hashing.
• Create a program that checks if a list contains any duplicates using a hash set.
• Write a function to find the longest substring with exactly two distinct characters using hashing.
• Implement a function to count the frequency of each letter in the English alphabet in a string using a hash map.
• Create a program to find the maximum product of any two numbers in an array using hashing.
• Write a function to check if a string is a valid identifier using hashing.
• Given a string, write a program to find all unique characters using a hash set.
• Implement a function to find the first character that appears an odd number of times using hashing.