Skip to main content
📜 WAYPOINT LESSON

Checkpoint: sort by key

⭐ beginner⏳ 25 min read📍 Lesson 44 of 256

Stable insertion sort on a computed key (last digit).

Sorting by a computed key with stability preserved is the exam's trickiest sort variant: compare (x % 10), shift only on strict inequality, and the original order of ties survives automatically.