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685B - Kay and Snowflake (Codeforces - Codeforces Round #359 (Div. 1) & Codeforces Round #359 (Div. 2)) categories

Category Problems Count
1 DFS & BFS & Dijkstra 565
2 data structures 489
3 Codeforces Div. 2 - D Problems 443
4 Best Problem Setters 410
5 trees 202