More Problems

• Write a program to check if a string is a valid hexadecimal color code.
• Write a program to find the first unique character in a string using a hash table.
• Write a program to implement a basic online bookstore with user reviews and ratings.
• Write a program to check if a number is a strong number using its prime factors.
• Write a program to find the longest common subsequence in a given matrix.
• Write a program to implement a simple online quiz application with random questions.
• Write a program to check if a string is a valid MAC address.
• Write a program to find the largest rectangle in a histogram.