- 404. Sum of Left Leaves (Easy)
- 129. Sum Root to Leaf Nodes (Medium)
- 623. Add one Row to the Tree (Medium)
- 988 Smallest String From Leaf (Medium)
- 456 Island Perimeter (Easy)
- 200 Count Islands (Medium)
- 1992 Find all groups of FarmLand (Medium)
- 1971 Find if path exists in Graph (Easy)
- 310 Minimum Height Trees (Medium)
- 514 Freedom Trail (Hard)
- 2331 Evaluate Boolean Binary Tree (Easy)
- 1325 Delete Leaves with a Given Value (Medium)
- 979 Distribute Coins in a Binary Tree (Medium)