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22E - Scheme (Codeforces - Codeforces Beta Round #22 (Div. 2 Only)) categories

Category Problems Count
1 Dynamic Programming 1210
2 DFS & BFS & Dijkstra 565
3 Codeforces Div. 2 - E Problems 439
4 graphs 291
5 trees 202
6 Heavy-Light Descomposition 36
7 Strongly Connected Components 15