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613D - Kingdom and its Cities (Codeforces - Codeforces Round #339 (Div. 1)) categories

Category Problems Count
1 DFS & BFS & Dijkstra 565
2 Best Problem Setters 410
3 sortings 316
4 graphs 289
5 Codeforces Div. 1, D 209
6 trees 201
7 divide and conquer 66