Red Black Ball
problem — every listed problem · all sets
- internal id
- p-8b4cf1ef
- appearances
- jakarta-2020 (jakarta-2020) — I
- held
- not recorded yet
- solve online
- Baekjoon Online Judge (wayback) closed 2026-04-28 id 20694
- data
- problemsets/jakarta-2020.yaml
St statement · D test data · IV/OV input/output validator · So solutions · P complete package — filled = held.