How to reduce a two dimensional array into a vector

Revision en2, by Basic_Jahid, 2017-09-12 23:13:15

In Codeforces Round 433 Div 2, I have seen a solution of problem E.

Since, the value of n was 200000. So it was not possible to solve the problem by declaring a n*n(200000*200000) array.

But, In that solution a solver has used a vector efficiently instead of two dimensional array. I have tried but couldn't got this.

Can anyone please help me on this?

Thanks in advance.

Problem :


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