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437D - The Child and Zoo (Codeforces - Codeforces Round #250 (Div. 2) & Codeforces Round #250 (Div. 1)) categories

Category Problems Count
1 Dynamic Programming 1209
2 Codeforces Div. 2 - D Problems 443
3 sortings 316
4 dsu 116
5 Minimum Spanning Tree 5