Singularity
problem — every listed problem · all sets
- internal id
- p-e509f4eb
- appearances
- shanghai-2025 (shanghai-2025) — C
- held
- not recorded yet
- solve online
- Luogu 洛谷 (Luògǔ) id P17123
- data
- problemsets/shanghai-2025.yaml
St statement · D test data · IV/OV input/output validator · So solutions · P complete package — filled = held.