- 404. Sum of Left Leaves (Easy)
- 623. Add one Row to the Tree (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)
- 2812 Find the safest path in a grid (Medium)