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353B - Two Heaps (Codeforces - Codeforces Round #205 (Div. 2)) categories

Category Problems Count
1 implementation 1054
2 math 679
3 Greedy 599
4 Codeforces Div. 2 - B Problems 457
5 constructive algorithms 331
6 sortings 316
7 combinatorics 215