More Problems

• Write a function to count the occurrences of a specific letter in a string using a hash map.
• Implement a function to find the longest substring that contains the same character using hashing.
• Create a program to check if two strings are made up of the same characters using hashing.
• Write a function to determine if a string can be rearranged to form a valid word using hashing.
• Given a list of integers, write a program to find the count of unique elements using a hash set.
• Implement a function to find the first non-repeating character in a string using a hash map.
• Create a program to count the total number of vowels in a string using a hash map.
• Write a function to find the first character that appears twice in a string using a hash map.