More Problems

• Write a program to check if a string is a valid email address using regular expressions.
• Write a program to find the total number of unique characters in a string using a hash table.
• Write a program to implement a simple text file compression algorithm.
• Write a program to check if two strings are anagrams using character counting.
• Write a program to find the longest increasing subsequence of integers in an array.
• Write a program to calculate the sum of the first n odd Fibonacci numbers.
• Write a program to implement a basic text-based RPG with quests and battles.
• Write a program to check if a number is a composite number.