Junior SDE Online Test at valkyrie: C++/C# Coding Challenges
Interview Experience
3 hours is more than enough for 4 questions. C++ or Csharp must be used. 1- Given a square matrix with values representing pixel colors black and white, implement a function that finds the largest sub
Full Details
3 hours is more than enough for 4 questions. C++ or Csharp must be used. 1- Given a square matrix with values representing pixel colors black and white, implement a function that finds the largest subsquare with all four borders filled with black pixels. The function should compute three values: row and column of the top left corner of the subsquare, and its side length. If no such subsquare exists, the return side length should be set to 0. 2- BST is mentioned earlier. 3- Given two sequences, A is numbers, and B is the number of rotations,
return 'a sequence of length equal to B, where the i-th element is the index of the largest value in sequence A after left rotation B[i] times.' 4- Not difficult.
About This Question
This is a candidate experience report from a valkyrie trading interview for a swe role (junior level) during the oa round reported in 2025.
It covers the following topics: Binary Tree, Bst, Matrix .
Difficulty rating: Hard
Topics
About Valkyrie Trading Interview Reports
This question was reported by a candidate who interviewed at Valkyrie Trading. 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 Valkyrie Trading are the higher-signal extractions to take from this report.
For broader preparation context, the Valkyrie Trading 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 Valkyrie Trading reports consistently are the ones worth investing in; one-off niche problems are not.
During Your Valkyrie Trading 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 Valkyrie Trading 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.