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685A - Robbers' watch (Codeforces - Codeforces Round #359 (Div. 1) & Codeforces Round #359 (Div. 2)) categories

Category Problems Count
1 Dynamic Programming 1209
2 math 679
3 brute force 494
4 Codeforces Div. 2 - C Problems 460
5 Best Problem Setters 410