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How to reduce a two dimensional array into a vector
By Jahid, history, 7 years ago, In English

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 : http://codeforces.net/contest/854/problem/E

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7 years ago, # |
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Which solution were you looking at?

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7 years ago, # |
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You have only one square per row and only one square per column, for a total of N squares, so you only need to store N values, you don't need 2D.

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