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317C - Balance (Codeforces - Codeforces Round #188 (Div. 1) & Codeforces Round #188 (Div. 2)) categories

Category Problems Count
1 DFS & BFS & Dijkstra 565
2 Codeforces Div. 2 - E Problems 438
3 constructive algorithms 331
4 graphs 291
5 trees 202