Lucid Coding Interview Questions
We track 7 coding questions asked at Lucid, tagged with the algorithms and concepts they test. The most common: Array, Depth-First Search, Hash Table, Stack, String.
Browse all 7 Lucid questions →Concept mix
Each question's weight is split evenly across its concepts, so the shares sum to 100%.
- Stack14.3%
- String11.9%
- Hash Table9.5%
- Tree8.3%
- Depth-First Search7.6%
- Design7.1%
- Array6.4%
- Binary Tree4.8%
- Counting4.8%
- Math4.8%
- Other (6)20.7%
How many questions involve each concept
Share of all 7 tracked Lucid questions that touch each concept. Questions usually involve several, so these overlap.
- Array28.6%
- Depth-First Search28.6%
- Hash Table28.6%
- Stack28.6%
- String28.6%
- Tree28.6%
- Binary Tree14.3%
- Breadth-First Search14.3%
- Counting14.3%
- Design14.3%
- Graph Theory14.3%
- Math14.3%
Where Lucid differs from the average company
Concept weight at Lucid relative to the average across all companies we track. Green means Lucid leans on it harder than most.
- Stack5.7×
- Tree5.5×
- Depth-First Search3.3×
- Hash Table1.4×
- Array0.33×
Lucid specialties
Concepts that show up at Lucid but are rarely asked elsewhere. They are easy to get blindsided by.
Difficulty mix
Level split of the 7 tracked Lucid questions.
- Junior29% (2)
- Mid/Senior57% (4)
- Staff14% (1)
Every concept in Lucid interviews
| Concept | Questions | % of questions | Share of mix |
|---|---|---|---|
| Array | 2 | 28.6% | 6.4% |
| Depth-First Search | 2 | 28.6% | 7.6% |
| Hash Table | 2 | 28.6% | 9.5% |
| Stack | 2 | 28.6% | 14.3% |
| String | 2 | 28.6% | 11.9% |
| Tree | 2 | 28.6% | 8.3% |
| Binary Tree | 1 | 14.3% | 4.8% |
| Breadth-First Search | 1 | 14.3% | 2.9% |
| Counting | 1 | 14.3% | 4.8% |
| Design | 1 | 14.3% | 7.1% |
| Graph Theory | 1 | 14.3% | 3.6% |
| Math | 1 | 14.3% | 4.8% |
| Matrix | 1 | 14.3% | 2.9% |
| Sliding Window | 1 | 14.3% | 4.8% |
| Topological Sort | 1 | 14.3% | 3.6% |
| Union-Find | 1 | 14.3% | 2.9% |
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