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
Trapezoid Walkway#6205
Medium
Full Tank#6221
Hard
Kingdom#6222
Hard
Food Review#6226
Very hard
Fare Dodging#6411
Very easy
Destination Unknown#6420
Very easy
Fence#6579
Medium
Stampede!#6651
Very hard
Arbitrage#6664
Medium
Subway#6769
Easy
Eco-driving#6831
Hard
Pirates#6900
Hard
Route Change#6928
Medium
Mass Production#6973
Very hard
Portals#7034
Medium
School#7096
Very easy
Queries on Graph#7248
Very easy
Distance on Triangulation#7564
Very easy