This problem is rated 2000, and yet no-one could solve it in official div1 + div2 round, is this a bug or is this task actually not that difficult?
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its joke) (or real bug)
also 1909I - Short Permutation Problem, is rated only 1900 despite being really difficult
this is also a similar blog pointing this issue, https://codeforces.me/blog/entry/126799