Codeforces Global Round 25
B
Battle Cows
Codeforces
1200
原题
← AC →
翻译中…
翻译中…

There are $n$ cows participating in a coding tournament. Cow $i$ has a Cowdeforces rating of $a_i$ (all distinct), and is initially in position $i$. The tournament consists of $n-1$ matches as follows:

翻译中…
  • The first match is between the cow in position $1$ and the cow in position $2$.
  • Subsequently, each match $i$ is between the cow in position $i+1$ and the winner of match $i-1$.
  • In each match, the cow with the higher Cowdeforces rating wins and proceeds to the next match.
翻译中…

You are the owner of cow $k$. For you, winning the tournament is not important; rather, you want your cow to win in as many matches as possible. As an acquaintance of the tournament organizers, you can ask them to swap the position of your cow with another cow only once, or you can choose to do nothing.

翻译中…

Find the maximum number of wins your cow can achieve.

翻译中…

Input

翻译中…

Each test contains multiple test cases. The first line contains an integer $t$ ($1 \le t \le 10^4$) — the number of test cases. The description of the test cases follows.

翻译中…

The first line of each test case contains two integers $n$ and $k$ ($2 \le n \le 10^5, 1 \le k \le n$) — the number of cows and your cow's index.

翻译中…

The second line of each test case contains $n$ integers $a_1, a_2, \ldots, a_n$ ($1 \le a_i \le 10^9$) — the Cowdeforces rating of the cows. It is guaranteed that $a_i$'s are pairwise different.

翻译中…

It is guaranteed that the sum of $n$ over all test cases does not exceed $10^5$.

翻译中…

Output

翻译中…

For each test case, print one integer: the maximum number of wins cow $k$ can achieve if you choose to swap (or do nothing) optimally.

翻译中…

Note

翻译中…

In the first test case, it is optimal to do nothing. Let $a'$ be the Cowdeforces rating of the cows in the original order (with your cow's rating bolded), then

翻译中…
  • Initially, $a' = [\mathbf{12}, 10, 14, 11, 8, 3]$.
  • Your cow plays against the cow with Cowdeforces rating $10$ and wins. $a' = [\mathbf{12}, 14, 11, 8, 3]$.
  • Your cow plays against the cow with Cowdeforces rating $14$ and loses.
翻译中…

In total, your cow wins $1$ match.

翻译中…

In the second test case, it is optimal to swap your cow to position $3$. Then, let $a'$ be the Cowdeforces rating of the cows in the order after the swap.

翻译中…
  • Initially, $a' = [7, 2, \mathbf{12}, 10, 727, 13]$.
  • The cow with Cowdeforces rating $7$ plays against the cow with Cowdeforces rating $2$ and wins. $a' = [7, \mathbf{12}, 10, 727, 13]$.
  • The cow with Cowdeforces rating $7$ plays against your cow, and your cow wins. $a' = [\mathbf{12}, 10, 727, 13]$.
  • Your cow plays against the cow with Cowdeforces rating $10$ and wins. $a' = [\mathbf{12}, 727, 13]$.
  • Your cow plays against the cow with Cowdeforces rating $727$ and loses.
翻译中…

In total, your cow wins $2$ matches.

翻译中…

样例

Input #1
3
6 1
12 10 14 11 8 3
6 5
7 2 727 10 12 13
2 2
1000000000 1
Output #1
1
2
0
InputCopy OutputCopy
题目信息
题号
1951B
时间限制
1 s
内存限制
256 MB
标签
二分
数据结构
贪心

题面与样例版权归 Codeforces 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。