Codeforces Round 616 (Div. 2)
C
Mind Control
Codeforces
未评级
原题
← BD →
翻译中…

You and your $n - 1$ friends have found an array of integers $a_1, a_2, \dots, a_n$. You have decided to share it in the following way: All $n$ of you stand in a line in a particular order. Each minute, the person at the front of the line chooses either the first or the last element of the array, removes it, and keeps it for himself. He then gets out of line, and the next person in line continues the process.

翻译中…

You are standing in the $m$-th position in the line. Before the process starts, you may choose up to $k$ different people in the line, and persuade them to always take either the first or the last element in the array on their turn (for each person his own choice, not necessarily equal for all people), no matter what the elements themselves are. Once the process starts, you cannot persuade any more people, and you cannot change the choices for the people you already persuaded.

翻译中…

Suppose that you're doing your choices optimally. What is the greatest integer $x$ such that, no matter what are the choices of the friends you didn't choose to control, the element you will take from the array will be greater than or equal to $x$?

翻译中…

Please note that the friends you don't control may do their choice arbitrarily, and they will not necessarily take the biggest element available.

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Input

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The input consists of multiple test cases. The first line contains a single integer $t$ ($1 \le t \le 1000$)  — the number of test cases. The description of the test cases follows.

翻译中…

The first line of each test case contains three space-separated integers $n$, $m$ and $k$ ($1 \le m \le n \le 3500$, $0 \le k \le n - 1$)  — the number of elements in the array, your position in line and the number of people whose choices you can fix.

翻译中…

The second line of each test case contains $n$ positive integers $a_1, a_2, \dots, a_n$ ($1 \le a_i \le 10^9$)  — elements of the array.

翻译中…

It is guaranteed that the sum of $n$ over all test cases does not exceed $3500$.

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Output

翻译中…

For each test case, print the largest integer $x$ such that you can guarantee to obtain at least $x$.

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Note

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In the first test case, an optimal strategy is to force the first person to take the last element and the second person to take the first element.

翻译中…
  • the first person will take the last element ($5$) because he or she was forced by you to take the last element. After this turn the remaining array will be $[2, 9, 2, 3, 8]$;
  • the second person will take the first element ($2$) because he or she was forced by you to take the first element. After this turn the remaining array will be $[9, 2, 3, 8]$;
  • if the third person will choose to take the first element ($9$), at your turn the remaining array will be $[2, 3, 8]$ and you will take $8$ (the last element);
  • if the third person will choose to take the last element ($8$), at your turn the remaining array will be $[9, 2, 3]$ and you will take $9$ (the first element).
翻译中…

Thus, this strategy guarantees to end up with at least $8$. We can prove that there is no strategy that guarantees to end up with at least $9$. Hence, the answer is $8$.

翻译中…

In the second test case, an optimal strategy is to force the first person to take the first element. Then, in the worst case, both the second and the third person will take the first element: you will end up with $4$.

翻译中…

样例

Input #1
4
6 4 2
2 9 2 3 8 5
4 4 1
2 13 60 4
4 1 3
1 2 2 1
2 2 0
1 2
Output #1
8
4
1
1
InputCopy OutputCopy
题目信息
题号
1291C
时间限制
1 s
内存限制
256 MB

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。