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520B - Two Buttons (Codeforces - Codeforces Round #295 (Div. 2)) categories

Category Problems Count
1 implementation 1054
2 math 679
3 Greedy 599
4 DFS & BFS & Dijkstra 565
5 Codeforces Div. 2 - A Problems 473
6 Codeforces Div. 2 - B Problems 456
7 Best Problem Setters 410
8 graphs 291
9 Problem list 100