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601D - Acyclic Organic Compounds (Codeforces - Codeforces Round #333 (Div. 1)) categories

Category Problems Count
1 DFS & BFS & Dijkstra 565
2 data structures 489
3 Codeforces Div. 1, D 209
4 trees 202
5 dsu 116
6 hashing 76