| 128 | Longest Consecutive Sequence | Hard |
| 130 | Surrounded Regions | Medium |
| 200 | Number of Islands | Medium |
| 399 | Evaluate Division | Medium |
| 547 | Friend Circles | Medium |
| 684 | Redundant Connection | Medium |
| 685 | Redundant Connection II | Hard |
| 695 | Max Area of Island | Medium |
| 721 | Accounts Merge | Medium |
| 765 | Couples Holding Hands | Hard |
| 778 | Swim in Rising Water | Hard |
| 785 | Is Graph Bipartite? | Medium |
| 803 | Bricks Falling When Hit | Hard |
| 827 | Making A Large Island | Hard |
| 839 | Similar String Groups | Hard |
| 886 | Possible Bipartition | Medium |
| 924 | Minimize Malware Spread | Hard |
| 928 | Minimize Malware Spread II | Hard |
| 947 | Most Stones Removed with Same Row or Column | Medium |
| 959 | Regions Cut By Slashes | Medium |
| 989 | Largest Component Size by Common Factor | Hard |
| 990 | Satisfiability of Equality Equations | Medium |
| 1020 | Number of Enclaves | Medium |
| 1061 | Lexicographically Smallest Equivalent String | Medium |
| 1202 | Smallest String With Swaps | Medium |
| 1254 | Number of Closed Islands | Medium |
| 1267 | Count Servers that Communicate | Medium |
| 1319 | Number of Operations to Make Network Connected | Medium |
| 1361 | Validate Binary Tree Nodes | Medium |
| 1391 | Check if There is a Valid Path in a Grid | Medium |