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Blackrock LeetCode Questions 2026

Browse LeetCode problems frequently asked by Blackrock. Filter by difficulty and timeframe to focus your interview prep.

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Valid Parentheses	EASY	50%	StringStack
Boundary of Binary Tree	MEDIUM	37.5%	TreeDepth-First SearchBinary Tree
Group Anagrams	MEDIUM	62.5%	ArrayHash TableStringSorting
Best Time to Buy and Sell Stock	EASY	62.5%	ArrayDynamic Programming
Happy Number	EASY	100%	Hash TableMathTwo Pointers
Maximum Profit From Trading Stocks	MEDIUM	50%	ArrayDynamic Programming
Maximum Subtree of the Same Color	MEDIUM	62.5%	ArrayDynamic ProgrammingTreeDepth-First Search
Find the Maximum Sum of Node Values	HARD	62.5%	ArrayDynamic ProgrammingGreedyBit ManipulationTreeSorting
Number of Islands	MEDIUM	37.5%	ArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix
Longest Palindromic Substring	MEDIUM	37.5%	Two PointersStringDynamic Programming
Two Sum	EASY	37.5%	ArrayHash Table
Missing Number	EASY	37.5%	ArrayHash TableMathBinary SearchBit ManipulationSorting
Climbing Stairs	EASY	37.5%	MathDynamic ProgrammingMemoization
Integer to Roman	MEDIUM	37.5%	Hash TableMathString

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