More Problems

• Write a program to check if a string is a valid time in 12-hour format.
• Write a program to calculate the sum of all odd prime numbers in a given range.
• Write a program to find the first non-repeating character in a string using a hash map.
• Write a program to implement a simple task scheduler that executes tasks at specified times.
• 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.