Black Square
problem — every listed problem · all sets
- internal id
- p-d447d64c
- appearances
- north-russia-2011 (north-russia-2011) — B
- held
- not recorded yet
- solve online
- Baekjoon Online Judge (wayback) closed 2026-04-28 id 3508
- data
- problemsets/north-russia-2011.yaml
St statement · D test data · IV/OV input/output validator · So solutions · P complete package — filled = held.