Скачать или смотреть 3408 Design Task Manager

3408 Design Task Manager. This Java code TaskManager uses a dual data structure approach to efficiently manage prioritized tasks:

Key Components
1. HashMap (taskMap): Fast O(1) lookups by taskId
2. TreeSet (taskSet): Automatically keeps tasks sorted by priority

Core Insight
The TreeSet automatically maintains sort order based on the compareTo method:
Higher priority tasks come first
If priorities are equal, higher taskId comes first

Key Operations
Add/Remove: Update both HashMap and TreeSet simultaneously
Edit: Remove from TreeSet → modify priority → add back (TreeSet re-sorts automatically)
Execute Top: Simply grab first() element from TreeSet (highest priority task)

Why This Works
HashMap: Instant access to any task by ID
TreeSet: Always knows which task has highest priority
Sync Both: Keep them perfectly synchronized

Time Complexity
All operations are O(log n) due to TreeSet operations.

The "Aha!" Moment
Instead of scanning all tasks to find the highest priority (O(n)), the TreeSet keeps them pre-sorted,
making the top task instantly available at first().