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519E - A and B and Lecture Rooms (Codeforces - Codeforces Round #294 (Div. 2)) categories

Category Problems Count
1 Dynamic Programming 1210
2 DFS & BFS & Dijkstra 565
3 data structures 489
4 Codeforces Div. 2 - E Problems 439
5 Binary Search & Ternary Search 350
6 trees 202
7 LCA 16
8 Lowest Common Ancestor 14