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321A - Ciel and Robot (Codeforces - Codeforces Round #190 (Div. 1) & Codeforces Round #190 (Div. 2)) categories

Category Problems Count
1 implementation 1054
2 math 679
3 Codeforces Div. 2 - C Problems 460
4 Best Problem Setters 410
5 Binary Search & Ternary Search 350