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553A - Kyoya and Colored Balls (Codeforces - Codeforces Round #309 (Div. 1) & Codeforces Round #309 (Div. 2)) categories

Category Problems Count
1 Dynamic Programming 1205
2 math 679
3 Codeforces Div. 2 - C Problems 460
4 Best Problem Setters 410
5 combinatorics 215