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27C - Unordered Subsequence (Codeforces - Codeforces Beta Round #27 (Codeforces format, Div. 2)) categories

Category Problems Count
1 Greedy 603
2 data structures 496
3 Codeforces Div. 2 - C Problems 460
4 Binary Search & Ternary Search 352
5 constructive algorithms 331