Pattern

Border DFS

3 problems in the roadmap use this pattern.

• Surrounded Regions Medium

  in Graphs (BFS, DFS, Grid)

  Reported at: GoogleBloombergUber+1
• Number of Enclaves Medium

  in Graphs (BFS, DFS, Grid)

  Reported at: Google
• Number of Closed Islands Medium

  in Graphs (BFS, DFS, Grid)