More Problems

• Create a program to find the total number of unique characters in a string using a hash set.
• Write a function to check if two arrays can be rearranged to form a valid word using hashing.
• Implement a function to find the longest substring with exactly k distinct characters using hashing.
• Create a program to find the first character that appears twice in a string using a hash map.
• Write a function to find the frequency of each digit in a number using hashing.
• Given a string, write a program to check if it is a valid identifier using hashing.
• Implement a function to find the maximum product of any two numbers in an array using hashing.
• Create a program to find the longest substring that contains the same character using hashing.