Just finished the Amazon 2026 OA recently. One-line summary: medium-high difficulty, more focus on real engineering thinking and optimization. But if your logic is clear and code is clean, finishing 2 questions within 70 minutes is absolutely doable.
The standard Amazon OA setup:
- 2 Coding Questions
- ~70 Minutes
- Platform: HackerRank (some roles include Work Simulation)
Below are the latest 2026 high-frequency problems with core ideas and speedrun strategies.
1. Minimum Number of Shipments
Problem
Given an array suppliers and a target demand target, find the minimum number of suppliers needed to meet or exceed the demand. Each supplier must be fully used. Return -1 if impossible.
Example
suppliers = [5,10,3,7], target = 15 → Output: 2
Solution Idea
- Classic greedy problem
- Sort suppliers in descending order
- Accumulate until reaching target
- Handle edge case: total sum < target → return -1
Key Insight: Always pick the largest available resource first.
2. Distinct Adjacent Differences
Problem
Given an array arr, modify elements (limited operations) so that all adjacent differences are unique. Return the minimum number of changes.
Solution Idea
- Traverse from left to right
- Use a set to track seen differences
- If conflict occurs → greedily adjust current element
Key Insight: This is an observation-heavy greedy problem — increasingly common in 2026 OA.
3. Subarray Sum Non-negative
Problem
Modify elements (within constraints) so that all subarrays (length ≥ 2) have non-negative sums. Return minimum operations.
Solution Idea
- Use prefix sum
- Track minimum prefix constraint
- Greedily fix positions causing negative contribution
Key Insight: A typical "anti-template" problem — requires real-time reasoning.
4. Warehouse / Package Allocation
Problem
Multiple warehouses with capacity and backup constraints. Choose one to upgrade while others must satisfy backup requirements.
Solution Idea
- Sort capacities
- Greedily pick upgrade target
- Check if remaining satisfy constraints
Key Insight: Resource allocation + greedy validation.
5. Other 2026 High-Frequency Variants
- Frequency-based Sorting (custom sorting rules)
- Prefix Frequency Split
- Sequence Construction problems
Amazon OA 2026 Trends
- Time Pressure: 2 questions / 70 minutes
- Difficulty: Medium → Medium-Hard
- Trend: More anti-LLM, less template-based
- Focus: Greedy, Prefix Sum, Simulation
Preparation Strategy
- Focus on LeetCode Amazon-tagged (last 6–12 months)
- Prioritize: Greedy, Prefix Sum, Heap
- Simulate real OA: 70 min / 2 problems
- Leave 10 minutes for edge case checks
Common Pitfalls:
- Edge cases (empty input, impossible case)
- Strict output format
- Off-by-one and boundary bugs
Need Help Passing OA Fast?
If you're short on time and want to maximize your chances, you can check out professional OA assistance:
👉 Amazon OA Assistance Service (HackerRank / CodeSignal)
- Full OA support (pass all test cases)
- Real-time interview guidance (VO support)
- End-to-end offer strategy
Final Thoughts
Amazon OA is no longer just about memorizing patterns. It's about clear thinking + fast implementation + solid edge-case handling.
Master these high-frequency patterns, and your pass rate will increase significantly.
Good luck with your Amazon OA — go get that offer 🚀
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