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274A - k-Multiple Free Set (Codeforces - Codeforces Round #168 (Div. 1) & Codeforces Round #168 (Div. 2)) categories

Category Problems Count
1 Greedy 599
2 Codeforces Div. 2 - C Problems 460
3 Binary Search & Ternary Search 350
4 sortings 316