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pc problems
Problem Name Online Judge Contest Difficulty Level
1 Powerful array Categories Codeforces Yandex.Algorithm 2011 Round 2 3
2 Sereja and Brackets Categories Codeforces Codeforces Round #223 (Div. 1) & Codeforces Round #223 (Div. 2) 3
3 Blue Mary Needs Help Again Categories SPOJ 3
4 Mike and Feet Categories Codeforces Codeforces Round #305 (Div. 1) & Codeforces Round #305 (Div. 2) 3
5 A and B and Interesting Substrings Categories Codeforces Codeforces Round #294 (Div. 2) 3