Blackrock Coding Interview Questions
We track 13 coding questions asked at Blackrock, tagged with the algorithms and concepts they test. The most common: Array, Hash Table, Dynamic Programming, Math, String.
Browse all 13 Blackrock questions →Concept mix
Each question's weight is split evenly across its concepts, so the shares sum to 100%.
- Array16.9%
- Hash Table13.2%
- String11.8%
- Dynamic Programming11.1%
- Math9.7%
- Two Pointers7.6%
- Bit Manipulation4.9%
- Sorting4.9%
- Stack4.2%
- Binary Search3.5%
- Other (7)12.4%
How many questions involve each concept
Share of all 13 tracked Blackrock questions that touch each concept. Questions usually involve several, so these overlap.
- Array53.8%
- Hash Table38.5%
- Dynamic Programming30.8%
- Math30.8%
- String30.8%
- Bit Manipulation23.1%
- Sorting23.1%
- Two Pointers23.1%
- Binary Search15.4%
- Breadth-First Search7.7%
- Depth-First Search7.7%
- Greedy7.7%
Where Blackrock differs from the average company
Concept weight at Blackrock relative to the average across all companies we track. Green means Blackrock leans on it harder than most.
- Bit Manipulation3.1×
- Two Pointers2.1×
- Hash Table2.0×
- Dynamic Programming1.8×
Blackrock specialties
Concepts that show up at Blackrock but are rarely asked elsewhere. They are easy to get blindsided by.
Difficulty mix
Level split of the 13 tracked Blackrock questions.
- Junior46% (6)
- Mid/Senior46% (6)
- Staff8% (1)
Every concept in Blackrock interviews
| Concept | Questions | % of questions | Share of mix |
|---|---|---|---|
| Array | 7 | 53.8% | 16.9% |
| Hash Table | 5 | 38.5% | 13.2% |
| Dynamic Programming | 4 | 30.8% | 11.1% |
| Math | 4 | 30.8% | 9.7% |
| String | 4 | 30.8% | 11.8% |
| Bit Manipulation | 3 | 23.1% | 4.9% |
| Sorting | 3 | 23.1% | 4.9% |
| Two Pointers | 3 | 23.1% | 7.6% |
| Binary Search | 2 | 15.4% | 3.5% |
| Breadth-First Search | 1 | 7.7% | 1.7% |
| Depth-First Search | 1 | 7.7% | 1.7% |
| Greedy | 1 | 7.7% | 1.4% |
| Matrix | 1 | 7.7% | 1.7% |
| Memoization | 1 | 7.7% | 2.8% |
| Stack | 1 | 7.7% | 4.2% |
| Tree | 1 | 7.7% | 1.4% |
| Union-Find | 1 | 7.7% | 1.7% |
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