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30E - Tricky and Clever Password (Codeforces - Codeforces Beta Round #30 (Codeforces format)) categories

Category Problems Count
1 Greedy 603
2 data structures 496
3 Codeforces Div. 2 - E Problems 439
4 Binary Search & Ternary Search 352
5 constructive algorithms 331
6 strings 217
7 hashing 77