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154C - Double Profiles (Codeforces - Codeforces Round #109 (Div. 1) & Codeforces Round #109 (Div. 2)) categories

Category Problems Count
1 Codeforces Div. 2 - E Problems 439
2 Best Problem Setters 410
3 sortings 316
4 graphs 291
5 hashing 76