doubt

Revision en2, by both_stars, 2020-06-24 10:25:38

Can someone help me in this question https://codeforces.me/contest/330/problem/D (give some idea to solve or easy code to understand)

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en3 English both_stars 2020-06-24 10:26:52 0 (published)
en2 English both_stars 2020-06-24 10:25:38 64 (saved to drafts)
en1 English both_stars 2020-06-24 10:21:25 97 Initial revision (published)