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D.E. Shaw DSA Interview Questions

Gunning for a D.E. Shaw & Co. SDE, Quant, or Technology Analyst offer in 2026? This DSA sheet is built specifically around what D.E. Shaw actually tests — sharp fundamentals in arrays and strings, rigorous recursion and backtracking, probability-flavored math problems, and system-style design questions that mirror their quant-trading and asset-management stack. Known for interviews that blend classic data structures with analytical puzzle-solving, D.E. Shaw expects candidates to explain trade-offs clearly, not just produce working code. This sheet compiles 63 of the most frequently reported D.E. Shaw interview questions sourced exclusively from LeetCode and GeeksforGeeks, tagged by topic, difficulty, and real candidate-reported frequency — so your prep time goes toward problems that actually show up in the loop, not generic grinding.

63 Problems
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1. Two Sum
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Hot
2. Reverse Integer
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Warm
3. String to Integer (atoi)
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Warm
4. Longest Common Prefix
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Warm
5. Merge Intervals
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Hot
6. Insert Interval
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Warm
7. Next Permutation
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Hot
8. Permutations II
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Warm
9. Combination Sum II
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Warm
10. N-Queens
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Hot
11. Sudoku Solver
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Warm
12. Generate Parentheses
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Hot
13. Longest Valid Parentheses
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Warm
14. Trapping Rain Water
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Hot
15. Median of Two Sorted Arrays
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Hot
16. Kth Largest Element in an Array
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Hot
17. Find Median from Data Stream
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Hot
18. Merge k Sorted Lists
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Warm
19. LRU Cache
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Very Hot
20. Copy List with Random Pointer
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Warm
21. Reverse Nodes in k-Group
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Warm
22. Binary Tree Maximum Path Sum
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Hot
23. Serialize and Deserialize Binary Tree
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Warm
24. Validate Binary Search Tree
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Hot
25. Construct Binary Tree from Preorder and Inorder Traversal
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Warm
26. Word Search II
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Warm
27. Implement Trie (Prefix Tree)
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Hot
28. Number of Islands
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Warm
29. Course Schedule
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Warm
30. Network Delay Time
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Hot
31. Cheapest Flights Within K Stops
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Warm
32. Word Ladder
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Warm
33. Word Break II
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Warm
34. Longest Increasing Subsequence
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Hot
35. Edit Distance
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Hot
36. Distinct Subsequences
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Warm
37. Interleaving String
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Warm
38. Palindrome Partitioning II
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Warm
39. Maximal Rectangle
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Warm
40. Largest Rectangle in Histogram
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Hot
41. Dungeon Game
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Warm
42. Burst Balloons
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Warm
43. Gas Station
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Warm
44. Candy
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Warm
45. Sum of Two Integers
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Warm
46. Single Number II
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Warm
47. Pow(x, n)
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Warm
48. Random Pick with Weight
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Hot
49. Shuffle an Array
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Warm
50. Insert Delete GetRandom O(1)
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Hot
51. Design Search Autocomplete System
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Warm
52. Design Hit Counter
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Warm
53. The Skyline Problem
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Warm
54. Egg Drop Puzzle
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Hot
55. Chinese Remainder Theorem
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Warm
56. Modular Exponentiation
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Warm
57. Find the Probability of a Coin Toss Sequence
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Warm
58. Reservoir Sampling
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Hot
59. Boyer-Moore Majority Vote Algorithm
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Warm
60. Matrix Chain Multiplication
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Warm
61. Design a Least Recently Used Cache with O(1) Operations
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Hot
62. Job Sequencing Problem
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Warm
63. Design an Order Matching Engine
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Hot