| ID | Title | Difficulty |
|---|---|---|
| 128 | Longest Consecutive Sequence | Hard |
| 130 | Surrounded Regions | Medium |
| 200 | Number of Islands | Medium |
| 547 | Friend Circles | Medium |
| 785 | Is Graph Bipartite? | Medium |
| 1361 | Validate Binary Tree Nodes | Medium |
| 1489 | Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree | Hard |
| 1584 | Min Cost to Connect All Points | Medium |
| 1970 | Last Day Where You Can Still Cross | Hard |
| 1971 | Find if Path Exists in Graph | Easy |
| 2092 | Find All People With Secret | Hard |