Question 1

How many LeetCode questions does BlackRock ask in interviews?

Accepted Answer

BlackRock has 14 known LeetCode interview questions. The difficulty breakdown is 6 Easy, 7 Medium, and 1 Hard problems.

Question 2

What are the most common topics in BlackRock coding interviews?

Accepted Answer

The most frequently asked topics at BlackRock are Array (9 questions), Dynamic Programming (6 questions), Hash Table (5 questions), Math (4 questions), String (4 questions). Focus on these topics to maximize your preparation.

Question 3

How should I prepare for a BlackRock coding interview?

Accepted Answer

Start with the most frequently asked BlackRock problems on CodeJeet, sorted by frequency. Focus on Medium difficulty first since BlackRock asks 7 Medium problems. Practice the top topics: Array, Dynamic Programming, Hash Table.

Title	Difficulty	Acceptance	Frequency	Topics
Happy Number	Easy	59.3%	100.0%	Hash TableMathTwo Pointers
Find the Maximum Sum of Node Values	Hard	69.5%	71.3%	ArrayDynamic ProgrammingGreedy+3
Maximum Subtree of the Same Color	Medium	58.3%	69.7%	ArrayDynamic ProgrammingTree+1
Group Anagrams	Medium	72.2%	60.8%	ArrayHash TableString+1
Best Time to Buy and Sell Stock	Easy	56.4%	57.6%	ArrayDynamic Programming
Valid Parentheses	Easy	43.7%	53.7%	StringStack
Maximum Profit From Trading Stocks	Medium	48.0%	48.7%	ArrayDynamic Programming
Longest Palindromic Substring	Medium	37.4%	41.7%	Two PointersStringDynamic Programming
Number of Islands	Medium	63.8%	41.7%	ArrayDepth-First SearchBreadth-First Search+2
Two Sum	Easy	57.1%	41.7%	ArrayHash Table
Missing Number	Easy	71.7%	41.7%	ArrayHash TableMath+3
Climbing Stairs	Easy	53.9%	41.7%	MathDynamic ProgrammingMemoization
Integer to Roman	Medium	70.5%	41.7%	Hash TableMathString
Find the Duplicate Number	Medium	64.0%	41.7%	ArrayTwo PointersBinary Search+1

BlackRock

Difficulty Distribution

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