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744A - Hongcow Builds A Nation (Codeforces - Codeforces Round #385 (Div. 1) & Codeforces Round #385 (Div. 2)) categories

Category Problems Count
1 DFS & BFS & Dijkstra 565
2 Codeforces Div. 2 - C Problems 460
3 Best Problem Setters 410
4 graphs 291