Each chapter opens one workspace
A chapter’s explanation, exercise and judge problems sit in one place, with a searchable chapter list and the next chapter at the end.
What changed
Chapter links on the Learn map open the lesson directly.
A searchable chapter list sits beside the lesson, and each lesson ends with the next chapter in map order. The map itself became a skill tree: a shared trunk of basics, then four branches.
Bridges, Euler tours and binary lifting got lessons of their own.