DE Shaw Coding Interview Questions (2026 Guide)
DE Shaw interviews sit between big-tech DSA and pure competitive programming. Expect a very high concentration of arrays, dynamic programming, and greedy problems, often with a mathematical or optimization twist.
This guide breaks down 211 real DE Shaw interview questions: which patterns dominate, the exact difficulty mix, the top 20 problems you should solve right now, and a focused 30-day plan to get you ready.
This guide breaks down 211 real DE Shaw interview questions: which patterns dominate, the exact difficulty mix, the top 20 problems you should solve right now, and a focused 30-day plan to get you ready.
📋 Table of Contents
Overview: What DE Shaw Actually Asks
Based on 211 real interview questions from DE Shaw, here's what you need to know:
Difficulty Breakdown:
Easy: 9% (20 questions)
Medium: 58% (123 questions)
Hard: 32% (68 questions)💡 Key Insight
Around one-third of DE Shaw questions are hard, so you must be comfortable going beyond medium-level LeetCode and tackling optimization-heavy and DP-style hard problems.Top 10 Patterns Asked at DE Shaw
| Rank | Pattern | Frequency | Questions |
|---|---|---|---|
| 1 | Array | 68.2% | 144 |
| 2 | Dynamic Programming | 33.6% | 71 |
| 3 | Sorting | 19.4% | 41 |
| 4 | Greedy | 19.0% | 40 |
| 5 | String | 18.5% | 39 |
| 6 | Hash Table | 18.0% | 38 |
| 7 | Binary Search | 13.7% | 29 |
| 8 | Heap (Priority Queue) | 11.8% | 25 |
| 9 | Stack | 10.4% | 22 |
| 10 | Matrix | 10.4% | 22 |
Pattern Strategy
- Master patterns 1–3 first — covers ~40–50% of DE Shaw questions.
- Patterns 4–7 are your insurance — covers another 20–30% and many optimization problems.
- Patterns 8–10 are bonus for senior roles or the hardest rounds.
Top 20 DE Shaw Interview Questions
The most frequently asked and recent problems from DE Shaw, grouped by difficulty:
🟢 Easy
| # | Problem | Patterns | Link |
|---|---|---|---|
| 1 | Majority Element | Array, Hash Table, Divide and Conquer | LeetCode → |
| 2 | Relative Sort Array | Array, Hash Table, Sorting | LeetCode → |
🟡 Medium
| # | Problem | Patterns | Link |
|---|---|---|---|
| 1 | Design A Leaderboard | Hash Table, Design, Sorting | LeetCode → |
| 2 | Find Minimum Cost to Remove Array Elements | Array, Greedy, Dynamic Programming | LeetCode → |
| 3 | Maximum Product Subarray | Array, Dynamic Programming | LeetCode → |
| 4 | Letter Combinations of a Phone Number | Hash Table, String, Backtracking | LeetCode → |
| 5 | Minimum Size Subarray in Infinite Array | Array, Hash Table, Sliding Window | LeetCode → |
| 6 | Maximum Subsequence Score | Array, Greedy, Sorting | LeetCode → |
| 7 | Removing Minimum Number of Magic Beans | Array, Greedy, Sorting | LeetCode → |
| 8 | Maximum Points Tourist Can Earn | Array, Dynamic Programming | LeetCode → |
🔴 Hard
| # | Problem | Patterns | Link |
|---|---|---|---|
| 1 | Binary Tree Cameras | Dynamic Programming, Tree, DFS | LeetCode → |
| 2 | Minimum Number of Taps to Open to Water a Garden | Array, Dynamic Programming, Greedy | LeetCode → |
30-Day DE Shaw Prep Plan
Week 1–2 Core Patterns (Focus on Top 3)
- Daily Goal: 2–3 problems from #Array, #Dynamic Programming, #Sorting.
- Day 1–7: Solve 15–20 easy/medium problems.
- Day 8–14: Re-solve Day 1–7 problems from memory (spaced repetition).
- Track: Tag all problems with "DE Shaw" in DSAPrep.dev.
Week 3 Mixed Difficulty Practice
- Daily Goal: 1 easy (warm-up) + 1–2 medium (challenge).
- Morning: Review problems from Week 1–2 using the "Due Today" queue.
- Afternoon: Solve 2 new DE Shaw–tagged problems.
- Evening: Watch one mock interview video (YouTube: "DE Shaw interview").
Week 4 Mock Interviews & Hard Problems
- Monday/Wednesday/Friday: Full mock (2 problems, 90 mins total).
- Tuesday/Thursday: Solve 1 hard problem + review weak patterns.
- Saturday: Review all problems from this month.
- Sunday: Rest or light review.
Self-Assessment — by end of Week 4 you should:
- ✅ Solve 70%+ DE Shaw easy problems in <10 mins.
- ✅ Solve 50%+ DE Shaw medium problems in <25 mins.
- ✅ Recognize top 5 patterns within 2 mins of reading a problem.
- ✅ Explain time/space complexity without hesitation.
What Makes DE Shaw Interviews Unique
📊 Heavy Array + DP + Greedy Mix
Arrays appear in over two-thirds of questions and DP in one-third, often combined with greedy or sorting to squeeze out optimal performance.📈 Optimization and Cost-Based Problems
Many problems revolve around minimizing or maximizing costs, scores, or resources, which rewards clear reasoning about invariants and state transitions.🧮 Strong Algorithmic and Math Intuition
While not as quant-heavy as some trading firms, DE Shaw still expects strong comfort with combinatorics, invariants, and edge-case reasoning in tough DP and greedy problems.🗣️ Emphasis on Explanation and Design
Problems like "Design A Leaderboard" show that clear data-structure design and verbal explanation matter as much as implementation.How to Track Your DE Shaw Prep with DSAPrep.dev
Step 1: Filter by Company
- Open DSAPrep.dev → Filter by "DE Shaw" to see all tagged problems in one view.
Step 2: Track Pattern Coverage
- Use the dashboard to find weak areas, for example: "DE Shaw DP Problems: 5/30 done (17%)."
- Prioritize arrays + DP + greedy before the interview window.
Step 3: Schedule Reviews
- Let spaced repetition resurface older DE Shaw questions in your "Due Today" queue.
- Aim for 3–5 review passes per key optimization or DP problem.
Step 4: Mock Interview Mode
- Pick 2–3 random DE Shaw mediums and one hard DP/greedy question.
- Time-box each to 40–45 minutes and narrate your approach before coding.
Common Mistakes in DE Shaw Prep
⚠️ Mistake 1: Underestimating DP and Greedy
Why it fails: With DP at 33.6% and greedy at 19.0%, weak skills in these patterns will show up quickly in interviews.
Better: Build a dedicated DP/greedy list and revisit those problems multiple times until transitions and proofs feel natural.⚠️ Mistake 2: Focusing Only on DE Shaw Tags
Why it fails: Company tags can be incomplete, and pattern gaps hurt more than missing a specific question you've seen before.
Better: Solve any array/DP/greedy problems that match the pattern profile, not just those tagged with DE Shaw.⚠️ Mistake 3: No Spaced Repetition
Why it fails: Hard optimization problems are easy to forget if you see them only once.
Better: Use DSAPrep.dev to review DE Shaw-style questions several times over 2–4 weeks.Conclusion: Your DE Shaw Interview Roadmap
Today
- Add the top 5–8 DE Shaw problems above to DSAPrep.dev.
- Decide whether DP, greedy, or arrays under pressure is your weakest area and note it explicitly.
This Week
- Solve 10–15 problems centered on your weakest pattern plus arrays.
- For each, write down the recurrence, greedy choice, or invariant that makes your solution correct.
This Month
- Complete 50–70 DE Shaw–tagged or DE Shaw–style problems with a bias toward optimization and DP.
- Run 3–4 timed mock interviews including at least one hard DP/greedy question per session.
- Review every key problem at least twice using spaced repetition.
🚀 Start Today
You will walk into DE Shaw interviews already used to array-heavy, DP- and greedy-focused questions, with clear explanations and optimizations ready.→ Start Tracking DE Shaw Prep on DSAPrep.dev (Free)