【cf425A】Sereja and Swaps

2014年4月28日1,1950

As usual, Sereja has array a, its elements are integers: a[1], a[2], …, a[n]. Let’s introduce notation:

A swap operation is the following sequence of actions:

  • choose two indexes i, j (i ≠ j);
  • perform assignments tmp = a[i], a[i] = a[j], a[j] = tmp.

What maximum value of function m(a) can Sereja get if he is allowed to perform at most k swap operations?

Input

The first line contains two integers n and k (1 ≤ n ≤ 200; 1 ≤ k ≤ 10). The next line contains n integers a[1]a[2]a[n] ( - 1000 ≤ a[i] ≤ 1000).

Output

In a single line print the maximum value of m(a) that Sereja can get if he is allowed to perform at most k swap operations.

Sample test(s)
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output

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题解

卧槽一开始看成相邻交换了。。。

枚举一个子串,将子串内尽量小的和子串外尽量大的尝试交换

然后没了。。