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461B - Appleman and Tree (Codeforces - Codeforces Round #263 (Div. 1) & Codeforces Round #263 (Div. 2)) categories

Category Problems Count
1 Dynamic Programming 1209
2 DFS & BFS & Dijkstra 565
3 Codeforces Div. 2 - D Problems 443
4 Best Problem Setters 410
5 trees 202