Uber interview question

- Prescreen: 4 LeetCode-style problems (70 min.) - First round: 1 LeetCode-style problem related to priority queue (1 hr.) - Second round: 2 LeetCode-style problem (one related to OOP and the other about binary search) (2 hr.) - Third Round: Hiring Manager interview (20 min. about schoolwork; 20 min. about work experience; 20 min. for me to ask questions) --- I solved all the problems and follow-ups but still got rejected without knowing the reason why.