Stevens-capital Online Assessment: Time Series Class Implementation
Question Details
Time Series class Write a time series class that stores and accesses double values based on time_t. The class should be capable of storing up to the most recent 5000 seconds of data. You should provid
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Time Series class Write a time series class that stores and accesses double values based on time_t. The class should be capable of storing up to the most recent 5000 seconds of data. You should provide the following functions:class TimeSeries { public: TimeSeries(size_t window); void AddValue(time_t current_time, double value); double GetValue(time_t desired_time); }; The AddValue function will be called with monotonically increasing values of current_time. That is, if AddValue is called for current_time = k, subsequent calls will be for times >= k. If there are multiple inserts for the same time_t value, use the latest one. If there were no inserts at a particular time, GetValue should return the value which was inserted prior to that time. For example:TimeSeries ts(5000); // object saves the most recent 5000 seconds ts.AddValue(10, 2.0); ts.AddValue(12, 3.0); ts.AddValue(14, 3.5); ts.GetValue(13); //
returns 3.0 ts.GetValue(14); //
returns 3.5 ts.GetValue(9); //
returns 0 ts.AddValue(5011, 4.0); ts.GetValue(9); // undefined — more than 5000 seconds ago Code will be evaluated by speed and design. Memory consumption is a secondary concern and correctness is essential. The class should be as fast as possible when the value is changed frequently or infrequently. Final reminder: this class should be fast. Please give me rice, please give me rice! !
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About Stevens Capital Interview Reports
This question was reported by a candidate who interviewed at Stevens Capital. LeakCode aggregates interview reports from 10+ sources, including 1Point3Acres, Glassdoor, LeetCode Discuss, Blind, Reddit, Indeed, and Nowcoder. Each report is translated where necessary, deduplicated against existing entries, and tagged by company, role, round type, and reporting date.
Use this question as one calibration data point, not a memorization target. Companies typically rotate their question pools every 2-4 months; the exact wording of a 2024 question may differ from what you encounter today. The underlying pattern, difficulty level, and follow-up depth at Stevens Capital are the higher-signal extractions to take from this report.
For broader preparation context, the Stevens Capital interview process typically includes a recruiter screen, one or two technical phone screens, and a 4-5 round on-site loop covering coding, system design (at L4+ levels), and behavioral. Reports tagged on LeakCode show the round-by-round distribution and typical difficulty calibration. To browse questions filtered by round type and seniority, use the company hub linked above.
How To Practice This Type of Question
Solve similar problems on LeetCode under timed conditions (25-35 minutes per medium difficulty). The goal is pattern recognition: recognize the underlying technique (sliding window, two-pointer, BFS, memoized recursion, etc.) within 60-90 seconds of reading. Strong candidates verbalize their hypothesis out loud before coding, then iterate based on feedback. Weak candidates dive into implementation immediately, lose time on the wrong approach, and run out of time for follow-ups.
Companies update their question pools every 2-4 months. The exact wording of any given question may have been retired by the time you interview. Focus your prep on the pattern, not the specific problem. The patterns that appear in Stevens Capital reports consistently are the ones worth investing in; one-off niche problems are not.
During Your Stevens Capital Round
Apply the standard interview round template: clarify requirements (2-3 minutes), state your approach out loud and confirm direction with the interviewer (3-5 minutes), code with narration (15-25 minutes), test with concrete examples including edge cases (5 minutes), discuss optimization or trade-offs if time permits (5 minutes). This template is universally accepted across FAANG and adjacent companies; deviating from it produces weaker interviewer feedback signal.
The single most predictive failure mode in Stevens Capital reports tagged "no hire": not asking clarifying questions. Interviewers are explicitly trained to weight this. Strong candidates ask 3-5 clarifying questions even on problems that look obvious; weak candidates dive into code immediately. The clarifying-question check is often the first signal recorded in the interviewer's written notes.