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0/1 BFS problems
Problem Name Online Judge Contest Difficulty Level
1 KATHTHI Categories SPOJ 2
2 Ocean Currents Categories UVA 4
3 Olya and Energy Drinks Categories Codeforces Codeforces Round #442 (Div. 2) 5
4 Three States Categories Codeforces Codeforces Round #327 (Div. 1) & Codeforces Round #327 (Div. 2) 5
5 Chamber of Secrets Categories Codeforces Croc Champ 2012 - Round 1 6
6 Error Categories A2 Online Judge 7