Graphs
25 problems — 2 easy, 19 medium, 4 hard.
| # | Title | Difficulty | Frequency |
|---|---|---|---|
| 127 | Word Ladder | hard | company favorite |
| 130 | Surrounded Regions | medium | frequently asked |
| 133 | Clone Graph | medium | frequently asked |
| 200 | Number of Islands | medium | company favorite |
| 207 | Course Schedule | medium | company favorite |
| 210 | Course Schedule II | medium | company favorite |
| 261 | Graph Valid Tree | medium | frequently asked |
| 269 | Alien Dictionary | hard | company favorite |
| 286 | Walls and Gates | medium | frequently asked |
| 323 | Number of Connected Components in an Undirected Graph | medium | frequently asked |
| 332 | Reconstruct Itinerary | hard | frequently asked |
| 399 | Evaluate Division | medium | frequently asked |
| 417 | Pacific Atlantic Water Flow | medium | frequently asked |
| 684 | Redundant Connection | medium | frequently asked |
| 695 | Max Area of Island | medium | frequently asked |
| 721 | Accounts Merge | medium | frequently asked |
| 743 | Network Delay Time | medium | frequently asked |
| 785 | Is Graph Bipartite? | medium | frequently asked |
| 787 | Cheapest Flights Within K Stops | medium | frequently asked |
| 841 | Keys and Rooms | medium | frequently asked |
| 994 | Rotting Oranges | medium | frequently asked |
| 997 | Find the Town Judge | easy | foundational |
| 1192 | Critical Connections in a Network | hard | company favorite |
| 1584 | Min Cost to Connect All Points | medium | frequently asked |
| 1971 | Find if Path Exists in Graph | easy | foundational |