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533B - Work Group (Codeforces - VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only)) categories

Category Problems Count
1 Dynamic Programming 1201
2 DFS & BFS & Dijkstra 565
3 Best Problem Setters 410
4 graphs 289
5 strings 215
6 trees 201
7 #Errichto 78