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83B - Doctor (Codeforces - Codeforces Beta Round #72 (Div. 1 Only) & Codeforces Beta Round #72 (Div. 2 Only)) categories

Category Problems Count
1 math 684
2 Codeforces Div. 2 - D Problems 443
3 Binary Search & Ternary Search 352
4 sortings 317