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Can someone explain Atcoder 269 Problem F solution?
I just read Problem F editorial.
I realise that computing the sum of the box is not very difficult. (Its just some interpolation of the sum of first n natural numbers).
But in this editorial the answer has directly been provided and the explanation for the jumps in reasoning are skipped.
I was hoping someone could provide an explanation to fill in the gaps of this editorial.
Thanks. :)
