Depth-first Search
Problems on depth-first search, including connected components, cycle detection, entry and exit times, bridges and articulation points, strongly connected components, topological sorting, and traversals of trees and grids.
The Graphs section of the library covers depth-first search, connected components, cycle detection, strongly connected components and topological sort. Related problem sets are under Graphs and Trees.
Problems
Dominoes#11323
Easy
Checks Post Facto#11346
Very hard
Dead-End Detector#11348
Very hard
Hobson's Trains#11351
Very hard
Subordinates#11429
Medium
Tree Distances I#11430
Medium
High Score#11445
Hard
The longest Path#11452
Medium
Rare Order#11511
Medium
Tree#11515
Hard
Hit the road!#11516
Very hard
Help for Bit#11518
Very hard
Boring tree queries#11544
Very hard
Uncrossed Knight's Tour#11563
Very hard
Finding pairs#11609
Medium