Shortest paths
Problems on shortest paths, including unweighted and weighted graphs, single-source and all-pairs distances, negative edges and negative cycles, grids and mazes, and paths with extra state such as fuel or time.
The Graphs section of the library covers breadth-first search, 0-1 BFS, Dijkstra's algorithm, Bellman-Ford, SPFA and Floyd-Warshall. Related problem sets are under Dijkstra algorithm, Breadth-first search and Graphs.
Problems
Median Weight Bead#4688
Medium
The Shortest Path#4856
Medium
Tree#4915
Very easy
Lasers#5161
Hard
Cycle#5178
Easy
Boat#5245
Very hard
Sliding Block Puzzle#5416
Very hard
Maximum flow of minimum cost#5447
Very easy
The Road to School#5486
Medium
Tunnel Network Optimization#5549
Very hard
Surely You Congest#5652
Very hard
Hexagonal Sticks#5702
Very hard
Timing#6039
Very hard
Go Go Gorelians#6057
Medium
Fiber Network#6119
Medium
Multi Path Story#6168
Very hard
InterCity#6171
Very easy