Blackrock Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Traverse a tree and answer 2D prefix sums
You are given two independent coding tasks. Task 1: In-order traversal of a binary tree Given the root of a binary tree, return the in-order traversal...
Design paint editor with undo/redo
Implement a simplified Paint editor that supports drawing on a 2D canvas and reverting changes using undo and redo operations. Canvas You are given a ...
Implement sorting and set intersection with input parsing
Write two functions and explain your approach in under two minutes after coding: (A) Sorting: Implement sort_numbers(nums: List[int]) -> List[int] tha...
Solve hierarchy distance and digit-square convergence
You have two independent tasks: A) Organization hierarchy distance Given a list of (employee, manager) pairs that form a complete hierarchy (a single ...