- Design Tweeter
- Employee Hierarchy
- Sudoku Generator and Solver
- Shorten URL
- Design Hit Counter
- Design Trie
- Two Sum
- Stream Checker
- Design Snake Game
- Permutations
- Inorder Successor
- Letter Combinations of a Phone Number
- Make Golf Course by removing obstacles
- Meeting rooms 2
- Missing Ranges(very tricky test cases)
- Zig Zag traversal of binary tree
- Vertical Traversal of bt
- Maze Solver
- Flip game
- Encoded String
- Connecting Cities (Kruskal's MST)
- Count Connected Components
- Sort Colours
- Unique paths
- Optimal Capacity for Shipping
- Boundary of bt
- Word ladder
- Circular Array Loop
- BST Iterator
- Game Theory
- Post order and preorder to construct binary tree
- Trading algorithms
- Course Schedule
- Course Schedule 2