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840A - Leha and Function (Codeforces - Codeforces Round #429 (Div. 1) & Codeforces Round #429 (Div. 2)) categories

Category Problems Count
1 math 679
2 Greedy 599
3 Codeforces Div. 2 - C Problems 460
4 sortings 316
5 Number Theory 250
6 combinatorics 215