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115A - Party (Codeforces - Codeforces Beta Round #87 (Div. 1 Only) & Codeforces Beta Round #87 (Div. 2 Only)) categories

Category Problems Count
1 Dynamic Programming 1199
2 DFS & BFS & Dijkstra 565
3 Codeforces Div. 2 - C Problems 459
4 graphs 289
5 trees 201