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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 1210
2 DFS & BFS & Dijkstra 565
3 Best Problem Setters 410
4 graphs 291
5 strings 216
6 trees 202
7 #Errichto 78