This self-check traces where received data loses identity, where a new container still shares state, and which algorithm contracts accept a weighted input.
Review the related lessons
- Python JSON duplicate keys: reject ambiguous object fields
- Python CSV headers: reject duplicate names before row mapping
- Python UTF-8 imports: reject malformed bytes and unexpected BOMs
- Python SQLite UNIQUE with NULL: an absent key can repeat
- Python sliding-window maximum: retain only useful deque indexes
- Python 0-1 BFS: shortest paths when every edge costs zero or one
Common Mistakes
A correct answer does not validate an uploaded payload, persistent service or unbounded graph. Run the linked fixtures and inspect their limits.