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289B - Polo the Penguin and Matrix (Codeforces - Codeforces Round #177 (Div. 2)) categories

Category Problems Count
1 Dynamic Programming 1201
2 implementation 1053
3 brute force 493
4 Codeforces Div. 2 - B Problems 456
5 Binary Search & Ternary Search 349
6 sortings 316