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685C - Optimal Point (Codeforces - Codeforces Round #359 (Div. 1) & Codeforces Round #359 (Div. 2)) categories

Category Problems Count
1 math 684
2 Codeforces Div. 2 - E Problems 439
3 Best Problem Setters 410
4 Binary Search & Ternary Search 352