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Usage history of an application can be analyzed by tracking user actions and behavior.
Collect data on user interactions with the application
Analyze the frequency and duration of usage
Identify patterns and trends in user behavior
Use data visualization tools to present findings
Consider user feedback and reviews for additional insights
Reverse alternate levels of a binary tree
Traverse the tree level by level
Reverse the nodes of alternate levels
Use a queue or stack to keep track of nodes at each level
Recursively apply the same process to the children of reversed nodes
Design a thread-safe LRU cache that can be scaled.
Use a ConcurrentHashMap to ensure thread safety.
Implement a doubly linked list to keep track of the least recently used items.
Use a HashMap to store the cache items for fast retrieval.
Implement a size limit for the cache and remove the least recently used item when the limit is reached.
To scale the cache, use a distributed cache like Redis or Memcached.
Design a file sharing mechanism between two users
Use a secure protocol like HTTPS or SFTP
Implement access control to ensure only authorized users can access the files
Consider implementing encryption to protect the files during transit and at rest
Provide a user-friendly interface for uploading and downloading files
Implement version control to track changes made to the files
Consider implementing a notification system to
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