OA-VO1-VO2 OA: including 4 ez-medium leetcode problems VO1: discussed personal experience first, then a ez-medium leetcode problem with special background, best solution is prefix sum VO2: disscussed personal experience first, then a medium leetcode problem, best solution is backtracking

The interview process is organized into three progressively challenging rounds: the first session focuses on problem-solving with a balanced mix of medium-difficulty and hard LeetCode questions, the second round escalates to exclusively hard-level LeetCode problems that probe algorithmic depth, while the third and final stage is a comprehensive behavioral interview assessing teamwork, communication style, and cultural fit.