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295A - Greg and Array (Codeforces - Codeforces Round #179 (Div. 1) & Codeforces Round #179 (Div. 2)) categories

Category Problems Count
1 implementation 1054
2 data structures 489
3 Codeforces Div. 2 - C Problems 460
4 Segment Tree 162
5 Binary Indexed Tree 69