C. Engineer Artem I solved this pathetic excuse of a 2000R problem yesterday. I have been trying to find the relation of this problem with FFT and CRT. The guide doesn't say anything related to CRT or FFT. Can anyone explain

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C. Engineer Artem I solved this pathetic excuse of a 2000R problem yesterday. I have been trying to find the relation of this problem with FFT and CRT. The guide doesn't say anything related to CRT or FFT. Can anyone explain

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In many such problems, tags are given wrong (for example, in roughly $$$80 \%$$$ of problems tagged as dp/greedy, there is no relation to dp/greedy at all). This is one of the things which I feel should be improved about codeforces. I would like to hear your thoughts on this.

Really $$$80$$$% ?.

Most of the problems tagged as DP do have a DP solution as much as I have observed.

Many times some other kind solution is more obvious and easy to click, but that doesn't means there is no DP solution of the problems.