More Problems

• Write a program to find the longest substring without repeating characters using a sliding window approach.
• Write a program to check if a number is a perfect number by calculating the sum of its divisors.
• Write a program to implement a simple online bookstore with search functionality.
• Write a program to calculate the total sales for each product in a sales report.
• Write a program to check if a string contains valid XML tags using a stack.
• Write a program to find the maximum length of a palindromic substring in a string.
• Write a program to implement a basic online course management system with user authentication.
• Write a program to check if a number is a palindromic number using a function.