More Problems

• Write a program to check if a string is a valid hexadecimal color code using regex.
• Write a program to find the total number of unique paths in a grid with obstacles.
• Write a program to implement a basic online bookstore with user reviews.
• Write a program to check if a number is a palindromic number using string reversal.
• Write a program to find the longest increasing subsequence using binary search.
• Write a program to check if two strings are equal ignoring spaces and punctuation.
• Write a program to implement a basic online quiz application with random questions.
• Write a program to find the first non-repeating character in a string using a function.