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766E - Mahmoud and a xor trip (Codeforces - Codeforces Round #396 (Div. 2)) categories

Category Problems Count
1 Dynamic Programming 1201
2 DFS & BFS & Dijkstra 565
3 data structures 488
4 Codeforces Div. 2 - E Problems 437
5 constructive algorithms 331
6 trees 201
7 bitmasks 113