graph 17
- Tree - Shortest Bridge
- Tree - Count Sub Islands
- Tree - Longest Increasing Path in a Matrix
- Tree - Rotting Oranges
- Tree - Walls and Gates
- Tree - Surrounded Regions
- Tree - Swim in Rising Water
- Tree - Reorder Routes to Lead to City Zero
- Tree - Island Perimeter
- Tree - Pacific Atlantic Water Flow
- Tree - Number of Islands
- Tree - Course Schedule
- Tree - Course Schedule II
- Tree - Word Ladder
- Tree - Graph Valid Tree
- Tree - Clone Graph
- Tree - Network Delay Time