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468C - Hack it! (Codeforces - Codeforces Round #268 (Div. 1) & Codeforces Round #268 (Div. 2)) categories

Category Problems Count
1 math 684
2 Codeforces Div. 2 - E Problems 439
3 Binary Search & Ternary Search 352
4 constructive algorithms 331