ivplay's blog

Problem reduction strategy (for newbies)
By ivplay, 11 years ago, In English

This post is only for newbies. A very common trick with Cumulative Sum + BIT is discussed with some examples and problems. Here is the link Thanks for reading.

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11 years ago, # |
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Can u give some related problems...?

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    11 years ago, # ^ |
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    You don't actually need ones. Just remember the idea how to count the number of elements in a multiset that lie between l and r. When you'll encounter this subproblem, use the algorithm that was explained here.

    I mean that IMHO it's not a good idea to look for a problem, for which you know in advance using what algorithm you'll solve it (exception: the case when you need to practise quick coding of a standard algorithm).

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    4 years ago, # ^ |
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    I think this one is similar https://atcoder.jp/contests/abc107/tasks/arc101_b

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