Robinhood Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Design a constrained cache and secure string validator
Part A — Constrained cache (LRU-like) Design an in-memory cache that supports the following operations: - get(key) -> value | null - put(key, value) -...
Compute nearest gate distance in grid
You are given an m x n grid representing a floor plan. - 0 = a gate - -1 = a blocked cell (wall/obstacle); cannot be entered - INF = an empty cell (a ...
Compute dependency load factors in a DAG
System Dependency Load Factor You are given: - programs: a list of unique program names (strings) - prerequisites: a list of pairs [a, b] meaning prog...
Compute trigger counts in a DAG
You are given a directed acyclic graph (DAG) that represents trigger dependencies between tasks. - Each node represents a task. - There is exactly one...
Design in-memory payment and friendship system
Design and implement an in-memory payment system with simple social features. The system processes a sequence of requests that can: 1. Register a user...
Design a referral leaderboard with chain-based counts
Design and implement a function that generates a referral leaderboard for a platform, given two equal-length arrays rh_users and new_users representin...
Implement string-based candlestick classifier
Implement a function that takes a single input string encoding N daily OHLC price records in the format "o1,h1,l1,c1;o2,h2,l2,c2;...;oN,hN,lN,cN" (sem...
Identify Overlapping Sessions and Optimize Coverage
Scenario During the technical screen, candidates must implement interval algorithms used in fraud-detection pipelines to reconcile overlapping user ac...