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552D - Vanya and Triangles (Codeforces - Codeforces Round #308 (Div. 2)) categories

Category Problems Count
1 math 679
2 brute force 494
3 data structures 489
4 Codeforces Div. 2 - D Problems 443
5 sortings 316
6 Geometry 254
7 combinatorics 215