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514C - Watto and Mechanism (Codeforces - Codeforces Round #291 (Div. 2)) categories

Category Problems Count
1 Codeforces Div. 2 - C Problems 460
2 Binary Search & Ternary Search 349
3 strings 216
4 hashing 75
5 Trie 41
6 string suffix structures 35