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📜 WAYPOINT LESSON

Checkpoint: Collections

⭐⭐ intermediate⏳ 15 min read📍 Lesson 78 of 180

Graded checkpoint: a Comparable leaderboard with a TreeSet-backed ranked view.

Checkpoint — collections

You can now: compose comparators for multi-level ordering, schedule with heaps, and choose the right exposure (view, copy, or literal) for shared data. Prove it with a leaderboard.