Segment tree or BIT problem

Правка en1, от Tanmoy1228, 2016-02-03 09:14:13

Problem: Walls of the North

can not understand the solution in editorial

can anyone give me any idea of solution in deails???

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en1 Английский Tanmoy1228 2016-02-03 09:14:13 249 Initial revision (published)