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515C - Drazil and Factorial (Codeforces - Codeforces Round #292 (Div. 2) & Codeforces Round #292 (Div. 1)) categories

Category Problems Count
1 Dynamic Programming 1199
2 implementation 1053
3 math 676
4 Greedy 598
5 Codeforces Div. 2 - C Problems 459
6 Best Problem Setters 410
7 sortings 316