I received the OA immediately after applying, got a perfect score, then received a rejection email a week later.
The problem was a cloud storage system. It had four levels. You only got the next level after finishing and submitting the current one.
Level 1: Support adding new files, retrieving files, and copying files.
Level 2: Support finding files by matching prefixes and suffixes.
Level 3: Support adding users with different capacity limits.
Level 4: Support compressing and decompressing files.
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