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Some problem were asked exactly same as available on Leetcode and some of them were similar or variations of the problems available.

Easy Problems –

1. Bulls and Cows
2. Contains Duplicate II
3. Valid Parentheses
4. Intersection of Two Linked Lists
5. Happy Number
6. Merge Two Sorted Lists
7. Single Number
8. Convert Sorted Array to Binary Search Tree
9. Contains Duplicate
10. Verifying an Alien Dictionary
11. Reverse Bits
12. Add Strings

Medium Problems –

1. Pour Water
2. IP to CIDR
3. Flatten 2D Vector
4. Design File System
5. Cheapest Flights Within K Stops
6. Flatten Nested List Iterator
7. Fraction to Recurring Decimal
8. Combination Sum
9. Wiggle Sort II
10. Koko Eating Bananas
11. Minimize Rounding Error to Meet Target
12. Pyramid Transition Matrix
13. Smallest Common Region
14. Coin Change
15. Add Two Numbers
16. Mini Parser
17. Longest Palindromic Substring
18. Contains Duplicate III
19. Wiggle Sort
20. Lowest Common Ancestor of a Binary Tree
21. Kth Largest Element in an Array
22. Design Circular Queue
23. Maximal Square
24. Add and Search Word – Data structure design
25. Find First and Last Position of Element in Sorted Array
26. Basic Calculator II
27. Convert to Base -2
28. Robot Bounded In Circle

Hard Problems –

1. Design In-Memory File System
2. Minimum Number of Flips to Convert Binary Matrix to Zero 3. Matrix
3. Maximum Candies You Can Get from Boxes
4. Merge k Sorted Lists
5. Median of Two Sorted Arrays
6. Minimum Window Substring
7. Maximum Profit in Job Scheduling
8. Regular Expression Matching
9. Word Search II
10. Guess the Word
11. Shortest Path to Get All Keys
12. Employee Free Time
13. Trapping Rain Water
14. Sliding Puzzle
15. Text Justification
16. Alien Dictionary
17. Palindrome Pairs