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Explore questions associated with Citadel. Review the source details, then use the workspace for code, notes, and diagrams.
65 questions in the library. A source association does not guarantee a future interview question.
Behavioral and leadership · Coding · Machine learning · Other questions · System design
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Showing 26–50
Companies: Citadel
Design a Spreadsheet class with 26 columns and a specified number of rows that supports setCell and resetCell operations and stores integer values (unset cells…
Companies: Citadel, Discord
Array · Design · Hash Table · Matrix
Companies: Citadel
Model Evaluation · Regression & Statistical Modeling
Companies: Citadel
Regression & Statistical Modeling
Evaluate the integer value of an expression given in Reverse Polish Notation, where tokens are integers or the operators +, -, *, / and all…
Companies: Citadel, Google
Array · Math · Stack
Companies: Citadel
Gave you a sequence of operations that move a robot, ask if the sequence repeat infinite time, whether the robot will get back to original…
Companies: Citadel
Companies: Citadel
Companies: Citadel
Design a data structure supporting insert(val), remove(val), and getRandom() — which returns a uniformly random existing element — with each operation in average O(1) time…
Companies: Citadel, Amazon, Apple, Bloomberg +7
Array · Design · Hash Table · Math
Companies: Citadel
Companies: Citadel
Companies: Citadel
Companies: Citadel
Simulate batched buy/sell order matching where each buy matches with the lowest-price sell (and each sell with the highest-price buy), allowing partial fills until no…
Companies: Citadel, Amazon
Array · Heap (Priority Queue) · Simulation
Companies: Citadel
Companies: Citadel