- Shortest XY distance in Grid
- Check Completeness of a Binary Tree
- Symmetric Tree
- Max Level Sum in Binary Tree
- Geek hates too many 1s
- Avoid Fire
- Number of Good Components
- Fill the Matrix
- Binary Tree Zigzag Level Order Traversal
- Minimum Distance Between BST Nodes
- Minimum Absolute Difference in BST
- Geeks Island
- Shortest Path with Alternating Colors
- As Far from Land as Possible
- Cheapest Flights Within K Stops
- Snakes and Ladders
- Populating Next Right Pointers in Each Node II
- Find Bottom Left Tree Value
- Knight Walk
- Unit Area of largest region of 1's
- Steps by Knight
- Rotten Oranges
- Distance of nearest cell having 1
- Topological sort
- Level of Nodes
- Find whether path exist
- Detect cycle in an undirected graph
- Detect cycle in an directed graph
- BFS of graph
- Course Schedule
- Maximum Depth of Binary Tree
- Course Schedule II
- Range Sum of BST
- Jump Game III
- Same Tree
- Lexicographically Smallest String After Applying Operations
- Sum of Left Leaves
- Coin Change
- Invert Binary Tree
- Surrounded Regions
- Shortest Path in Binary Matrix
- Cousins in Binary Tree
- Rotting Oranges
- Populating Next Right Pointers in Each Node
- Merge Two Binary Trees
- Number of Islands
- Max Area of Island
- Flood Fill
- Find All Groups of Farmland
- Count Sub Islands