The first round was the DS and Algo round. The interviewer presented the following problem. I explained my solution, and they seemed okay with it. However, due to time constraints, I couldn't complete the code. They expected workable code within 20 minutes, which was not possible for the given problem. It felt like an unrealistic interview.

Furthermore, the interviewer seemed busy with their own work and barely listened to me. I did not appreciate their careless attitude.

You are given N courses, from 0 to N-1.

prerequisites[i] = [ai, bi] means you must complete course bi before taking course ai.

Return true if you are able to complete all the courses. Otherwise, return false.

Example 1:

Input: numCourses = 2, prerequisites = [[1,0]] Output: true Explanation: There are a total of 2 courses to take. To take course 1, you should have finished course 0. So, it is possible.

Example 2:

Input: numCourses = 5, prerequisites = [[1,0], [2, 0], [4, 3]] Output: false Explanation: There are a total of 5 courses to take. To take course 1, you should have finished course 0. To take course 2, you should have finished course 0. To take course 4, you should have finished course 3. However, there is no prerequisite for course 0 or course 3, and there's no way to complete all courses if there are circular dependencies like in a scenario where course 0 requires course 1 and course 1 requires course 0. In this specific input, it's impossible to complete all courses due to an implied circular dependency or a situation where prerequisites cannot be met in a linear fashion.