- Count distinct elements in every window
- Swap all odd and even bits
- Maximum difference of zeros and ones in binary string
- Smallest range in K lists
- Check for BST
- Vertical Traversal of Binary Tree
- Restricted Pacman
- Sort a stack
- Finding middle element in a linked list
- Count Occurences of Anagrams
- Largest subarray with 0 sum
- Check Tree Traversal
- Count total set bits
- Factorials of large numbers
- Median of 2 Sorted Arrays of Different Sizes
- Expression Add Operators
- Spiral order in matrix.
- K-th element of two sorted Arrays
- N meetings in one room
- Sort an array of 0s, 1s and 2s
- Remove loop in Linked List