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337D - Book of Evil (Codeforces - Codeforces Round #196 (Div. 2) & Codeforces Round #196 (Div. 1)) categories

Category Problems Count
1 Dynamic Programming 1201
2 DFS & BFS & Dijkstra 565
3 Codeforces Div. 2 - D Problems 443
4 trees 201
5 divide and conquer 66