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191C - Fools and Roads (Codeforces - Codeforces Round #121 (Div. 1) & Codeforces Round #121 (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 trees 202
6 LCA 16
7 Lowest Common Ancestor 14