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520C - DNA Alignment (Codeforces - Codeforces Round #295 (Div. 2) & Codeforces Round #295 (Div. 1)) categories

Category Problems Count
1 math 679
2 Greedy 599
3 Codeforces Div. 2 - C Problems 460
4 Best Problem Setters 410
5 strings 216