More Problems

• Write a program to check if a string is a valid hex number.
• Write a program to find the first unique character in a string with the least number of appearances.
• Write a program to implement a simple online course platform with user enrollment.
• Write a program to check if a number is a strong composite number.
• Write a program to find the longest common subsequence using memoization.
• Write a program to implement a simple chat application using sockets.
• Write a program to check if a binary tree is symmetric.
• Write a program to find the total number of unique paths in a grid from the top-left to the bottom-right corner.