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533A - Berland Miners (Codeforces - VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only)) categories

Category Problems Count
1 Greedy 599
2 DFS & BFS & Dijkstra 565
3 data structures 489
4 Best Problem Setters 410
5 Binary Search & Ternary Search 349
6 trees 202
7 #Errichto 78