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  1. Design Parking Lot
  • Single Entry and Exit Gates
  • Multiple Entry and Exit Gates
  1. Design Multiplayer Sudoku Game
  • Players have to Rotate the Pin in order to decide the turn.
  • Player who is able to fill the last empty cell will win.
  1. Design LRU (Static + Dynamic Input Flow)
  • Follow Up : Implement LFU with Least Changes in the previous design (LRU)
  1. Design In Memory Cache
  2. Design Snake and Ladder Game
  • How would you change the design if wild cards are allowed.
  1. Design Exception Class With Test Cases
  • Note: Don't forget to use Singleton Pattern Here.
  1. Design Money Splitter
  2. Design Notification Service
  3. Design Message Queue
  4. Design a Terminal/Command Prompt

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  1. Design Whatsapp
  2. Design Uber Backend
  3. Design Tiny URL
  4. Design Dream11
  5. Design Leetcode
  6. Design MS Teams
  7. Design Dominos/PizzaHut
  8. Design Big Bazaar
  9. Design Zomato/Swiggy
  10. Design Docker

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  1. Reverse Vowels in the string.
  • Using Constant space
  1. Longest Palindromic Substring.
  2. Find the largest island in Matrix of 0s and 1s
  3. Longest Repeating Subsequence
  4. Compress and Uncompress a Tree/Graph/LinkedList
  5. All Variations of Jump Game
  6. All Variations of Stocks Buy and Sell DP
  7. Word Search 1/2
  8. Median of 2 sorted arrays
  9. Kth largest/smallest element in the rowwise and columnwise sorted Matrix
Note: All the above questions are sorted by their Frequency. 
by Expert (30,360 points)