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229B - Planets (Codeforces - Codeforces Round #142 (Div. 1) & Codeforces Round #142 (Div. 2)) categories

Category Problems Count
1 DFS & BFS & Dijkstra 569
2 data structures 496
3 Codeforces Div. 2 - D Problems 443
4 Binary Search & Ternary Search 352