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375D - Tree and Queries (Codeforces - Codeforces Round #221 (Div. 1)) categories

Category Problems Count
1 DFS & BFS & Dijkstra 565
2 data structures 488
3 Codeforces Div. 1, D 209
4 trees 201
5 Segment Tree 162
6 MO?s Algorithm (Query square root decomposition) 24