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243B - Hydra (Codeforces - Codeforces Round #150 (Div. 1) & Codeforces Round #150 (Div. 2)) categories

Category Problems Count
1 data structures 489
2 Codeforces Div. 2 - D Problems 443
3 sortings 316
4 graphs 291
5 Codeforces Practice List 15