P12801 [NERC 2022] Lisa's Sequences

Lisa loves playing with the sequences of integers. When she gets a new integer sequence $a_i$ of length $n$, she starts looking for all $\textit{monotone}$ subsequences. A monotone subsequence $[l, r]$ is defined by two indices $l$ and $r$ ($1 \le l < r \le n$) such that $\forall i = l, l+1, \ldots, r-1: a_i \le a_{i+1}$ or $\forall i = l, l+1, \ldots, r-1: a_i \ge a_{i+1}$. Lisa considers a sequence $a_i$ to be $\textit{boring}$ if there is a monotone subsequence $[l, r]$ that is as long as her boredom threshold $k$, that is when $r - l + 1 = k$. Lucas has a sequence $b_i$ that he wants to present to Lisa, but the sequence might be boring for Lisa. So, he wants to change some elements of his sequence $b_i$, so that Lisa does not get bored playing with it. However, Lucas is lazy and wants to change as few elements of the sequence $b_i$ as possible. Your task is to help Lucas find the required changes.

The first line of the input contains two integers $n$ and $k$ ($3 \le k \le n \le 10^6$) --- the length of the sequence and Lisa's boredom threshold. The second line contains $n$ integers $b_i$ ($1 \le b_i \le 99\,999$) --- the original sequence that Lucas has.

On the first line output an integer $m$ --- the minimal number of elements in $b_i$ that needs to be changed to make the sequence not boring for Lisa. On the second line output $n$ integers $a_i$ ($0 \le a_i \le 100\,000$), so that the sequence of integers $a_i$ is not boring for Lisa and is different from the original sequence $b_i$ in exactly $m$ positions.