Sign In Pages

Problem Overview

• Implement sign-in pages by simulating three APIs: Register, Login, Logout, and produce a response per request.
• Input: ordered array of API request strings. Output: array of responses. Usernames and passwords are case-sensitive.
• Start with no users; if a user is already logged in, a new Login is unsuccessful; process requests in order.
• Real-world authentication scenario; an Amazon interviews coding interview problem and common interview question.