More Problems

• Create a program to find the total number of unique characters in a 2D array using hashing.
• Write a function to find the first character that appears twice in a string using a hash map.
• Implement a function to check if a string is a valid identifier using hashing.
• Create a program to find the total number of characters in a string excluding spaces using hashing.
• Write a function to determine if two strings can be rearranged to form a valid word using hashing.
• Given a string, write a program to find the longest substring that is a palindrome using hashing.
• Create a function that checks if a string can be split into two palindromes using hashing.
• Write a function to count the occurrences of each letter in the English alphabet in a string using a hash map.