NEED HELP IN A PROBLEM

Правка en1, от javacoder1, 2015-11-18 01:51:40

I was trying to solve subsequences http://mirror.codeforces.com/problemset/problem/597/C of Testing Round #12 but could not figure out the solution.Can anyone explain the solution using binary indexed tree.

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en1 Английский javacoder1 2015-11-18 01:51:40 225 Initial revision (published)