Practice

Prepare for Citadel Securities

The problems worth doing for this kind of loop — grouped by what the round tests, not by leaked question lists.

Practice problems, with your status, difficulty and topics
Status	Problem	Format	Level
Not started	Bounded producer-consumer queuec++concurrencycondition-variablequeues	Written	medium
Not started	Design an LRU cachecachingconcurrencydata-structureslld	Written	medium
Not started	Kth largest in a streamheapstreamingtop-k	Written	medium
Not started	Search a rotated sorted arrayarraysbinary-search	Written	medium
Not started	Tell me about the most ambiguous problem you have worked onambiguitybehavioralstar	Written	medium
Not started	The loop that should be fast and is notc++cachememoryperformance	Written	medium
Not started	When is an atomic not enough?atomicsc++concurrencymutex	Written	medium
Not started	Why did my counter get slower with more threads?c++cacheconcurrencyperformance	Written	medium
Not started	Design a limit order bookdata-structureslldlow-latencytrading	Written	hard
Not started	Design a market data distribution systemlock-freelow-latencymarket-datasystem-design	Written	hard
Not started	Fewest machines to finish by a deadlinebinary-searchgreedyoptimisation	Written	hard
Not started	Take-home: trade reconciliationcorrectnessdatatake-hometrading	Written	hard
Not started	The ABA problematomicsc++concurrencylock-free	Written	hard
Not started	Was double-checked locking ever actually broken?c++concurrencymemory-modelsingleton	Written	hard
Not started	What does memory_order_relaxed actually guarantee?atomicsc++concurrencymemory-model	Written	hard
Not started	What is the hardest technical problem you have solved?behavioralstartechnical-depth	Written	hard