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372D - Choosing Subtree is Fun (Codeforces - Codeforces Round #219 (Div. 1)) categories

Category Problems Count
1 DFS & BFS & Dijkstra 565
2 data structures 488
3 Best Problem Setters 410
4 Binary Search & Ternary Search 349
5 Codeforces Div. 1, D 209
6 trees 201
7 two pointers 128