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778C - Peterson Polyglot (Codeforces - Codeforces Round #402 (Div. 1) & Codeforces Round #402 (Div. 2)) categories

Category Problems Count
1 DFS & BFS & Dijkstra 565
2 brute force 494
3 trees 202
4 Codeforces Div. 2 - F Problems 119
5 dsu 116
6 hashing 76