> For the complete documentation index, see [llms.txt](https://dvpr.gitbook.io/coding-interview-patterns/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dvpr.gitbook.io/coding-interview-patterns/16.-pattern-topological-sort-graph/16.1-introduction.md).

# 16.1 Introduction