Explain a real-world scenario where handling the absence of a key in a map is crucial.
- Managing user authentication and access control.
- Sorting and searching a list of items.
- Reading and writing files from disk.
- Calculating mathematical equations.
Handling the absence of a key in a map is crucial in scenarios like user authentication and access control. When a user tries to log in, their credentials are typically checked against a map of user accounts. If the user's account exists, access is granted; otherwise, it's denied. Properly handling the absence of a key (user account) in this map is essential for ensuring secure and controlled access to an application or system.
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