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How to reduce a two dimensional array into a vector
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.
