Checkpoint: The Delete-One Verdict

Challenge on lesson: Checkpoint — Trust the Loop, Not Your Eyes

CHALLENGE

Difficulty: advanced+25 XP

**Bài toán.** As practiced: implement the corrected linear candidate for "delete at most one element → non-decreasing" and run the 4000-trial harness (seed 777, values 0–4) against the deletion oracle. **Output:** OK 4000 when the harness passes.

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Back to lesson: Checkpoint — Trust the Loop, Not Your Eyes