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739B - Alyona and a tree (Codeforces - Codeforces Round #381 (Div. 1) & Codeforces Round #381 (Div. 2)) categories

Category Problems Count
1 DFS & BFS & Dijkstra 565
2 data structures 488
3 Codeforces Div. 2 - D Problems 443
4 Binary Search & Ternary Search 349
5 graphs 289
6 trees 201