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citadel

67 interview questions available

Compute BBO and NBBO from order data

Compute maximum later-earlier difference

Simulate 2048 and pack board into uint64

Design dynamic weighted random sampling with updates

Design alerting for application-to-exchange mappings

Implement task queue with insert, delete, execute

Implement LRU/LFU cache with custom eviction

Find constant minimizing absolute error

Merge K timestamped lists with timestamp coalescing

Implement array merge, round-robin scheduler, and trading simulator