More Problems

• Write a program to implement a simple online quiz application with random questions.
• Write a program to find the shortest path in a grid with obstacles using A* search.
• Write a program to check if a number can be expressed as the sum of three squares.
• Write a program to find the longest palindromic substring using a two-pointer approach.
• Write a program to implement a basic user authentication system with login/logout functionality.
• Write a program to check if a number is a happy number using a function.
• Write a program to find the longest common prefix among an array of strings.
• Write a program to implement a simple online task manager with deadlines.