Sig Coding Interview Questions
We track 10 coding questions asked at Sig, tagged with the algorithms and concepts they test. The most common: Array, Hash Table, Matrix, Simulation, Binary Search.
Browse all 10 Sig questions →Concept mix
Each question's weight is split evenly across its concepts, so the shares sum to 100%.
- Array30.3%
- Hash Table11.7%
- Matrix10.0%
- Simulation9.2%
- String5.8%
- Binary Search5.3%
- Ordered Set5.3%
- Depth-First Search3.3%
- Enumeration3.3%
- Math3.3%
- Other (5)12.3%
How many questions involve each concept
Share of all 10 tracked Sig questions that touch each concept. Questions usually involve several, so these overlap.
- Array100.0%
- Hash Table40.0%
- Matrix30.0%
- Simulation30.0%
- Binary Search20.0%
- Ordered Set20.0%
- String20.0%
- Binary Indexed Tree10.0%
- Depth-First Search10.0%
- Design10.0%
- Enumeration10.0%
- Math10.0%
Where Sig differs from the average company
Concept weight at Sig relative to the average across all companies we track. Green means Sig leans on it harder than most.
- Ordered Set17.7×
- Simulation5.4×
- Matrix4.3×
- Binary Search1.8×
- String0.61×
Sig specialties
Concepts that show up at Sig but are rarely asked elsewhere. They are easy to get blindsided by.
Difficulty mix
Level split of the 10 tracked Sig questions.
- Mid/Senior80% (8)
- Staff20% (2)
Every concept in Sig interviews
| Concept | Questions | % of questions | Share of mix |
|---|---|---|---|
| Array | 10 | 100.0% | 30.3% |
| Hash Table | 4 | 40.0% | 11.7% |
| Matrix | 3 | 30.0% | 10.0% |
| Simulation | 3 | 30.0% | 9.2% |
| Binary Search | 2 | 20.0% | 5.3% |
| Ordered Set | 2 | 20.0% | 5.3% |
| String | 2 | 20.0% | 5.8% |
| Binary Indexed Tree | 1 | 10.0% | 2.0% |
| Depth-First Search | 1 | 10.0% | 3.3% |
| Design | 1 | 10.0% | 2.5% |
| Enumeration | 1 | 10.0% | 3.3% |
| Math | 1 | 10.0% | 3.3% |
| Segment Tree | 1 | 10.0% | 2.0% |
| Trie | 1 | 10.0% | 2.5% |
| Two Pointers | 1 | 10.0% | 3.3% |
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