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Level: Senior-Level
Round: Onsite · Type: Coding · Difficulty: 8/10 · Duration: 120 min · Interviewer: Unfriendly
Topics: Data Structures, Algorithms, Bit Manipulation, Mathematics
Location: Mountain View, CA
Interview date: 2025-12-31
Got offer: False
Question: LeetCode Hard question involving data structures and algorithms. I was asked about my approach, complexity, and edge cases.
Question: A challenging question involving mathematics, bit manipulation, and range derivation. I needed to simplify the expression into a prefix XOR form and analyze the conditions for inequality from a bit perspective. I didn't finish in time.
The first round was a pure coding challenge, a LeetCode Hard problem involving a combination of data structures and algorithms. It required designing appropriate data structures and completing the statistics within given time complexity constraints. I was questioned about my problem-solving approach, complexity, and edge cases.
The second round's problem was more difficult, leaning towards mathematics, bit operations, and interval derivation. The problem statement was as follows:
Given there are N numbers, a1, a2…, an. N <= 10^5, ai <= 10^9. You have to find all possible combinations (x,y,z) where F(x,y) xor F(y,z) > F(x,z) with F(i,j) = ai xor ai+1 xor ai+2 xor …aj.
During the discussion, the expression needed to be simplified into a prefix XOR form. Further analysis was required from a bit perspective to determine the conditions under which the inequality holds. The interview involved a bit-by-bit analysis and the impact of different bit positions on the result's magnitude. However, I could not provide a complete and implementable solution after completing the derivation within the time limit.
LeetCode similar: LeetCode Hard