Problem:
Score : 100 points

Problem Statement

Taro and Jiro will play the following game against each other.

Initially, they are given a sequence a = (a_1, a_2, \ldots, a_N).
Until a becomes empty, the two players perform the following operation alternately, starting from Taro:

Remove the element at the beginning or the end of a. The player earns x points, where x is the removed element.

Let X and Y be Taro's and Jiro's total score at the end of the game, respectively.
Taro tries to maximize X - Y, while Jiro tries to minimize X - Y.

Assuming that the two players play optimally, find the resulting value of X - Y.

Constraints

All values in input are integers.

1 \leq N \leq 3000

1 \leq a_i \leq 10^9

Input

Input is given from Standard Input in the following format:

N
a_1 a_2 \ldots a_N

Output

Print the resulting value of X - Y, assuming that the two players play optimally.

Sample Input 1

4
10 80 90 30

Sample Output 1

10

The game proceeds as follows when the two players play optimally (the element being removed is written bold):

Taro: (10, 80, 90, 30) → (10, 80, 90)

Jiro: (10, 80, 90) → (10, 80)

Taro: (10, 80) → (10)

Jiro: (10) → ()

Here, X = 30 + 80 = 110 and Y = 90 + 10 = 100.

Sample Input 2

3
10 100 10

Sample Output 2

-80

The game proceeds, for example, as follows when the two players play optimally:

Taro: (10, 100, 10) → (100, 10)

Jiro: (100, 10) → (10)

Taro: (10) → ()

Here, X = 10 + 10 = 20 and Y = 100.

Sample Input 3

1
10

Sample Output 3

10

Sample Input 4

10
1000000000 1 1000000000 1 1000000000 1 1000000000 1 1000000000 1

Sample Output 4

4999999995

The answer may not fit into a 32-bit integer type.

Sample Input 5

6
4 2 9 7 1 5

Sample Output 5

2

The game proceeds, for example, as follows when the two players play optimally:

Taro: (4, 2, 9, 7, 1, 5) → (4, 2, 9, 7, 1)

Jiro: (4, 2, 9, 7, 1) → (2, 9, 7, 1)

Taro: (2, 9, 7, 1) → (2, 9, 7)

Jiro: (2, 9, 7) → (2, 9)

Taro: (2, 9) → (2)

Jiro: (2) → ()

Here, X = 5 + 1 + 9 = 15 and Y = 4 + 7 + 2 = 13.

Solution in Ruby (2.3.3) (judge verdict: Time Limit Exceeded)



def solve(dp,a,left,right,turn)
  if dp[left][right] != nil
    return dp[left][right]
  end

  if left == right
    if turn.odd?
    # Tao
      return dp[left][right] = a[left]
    else
    # Jiro
      return dp[left][right] = -a[left]  
    end
  end

  if turn.odd?
    # taro
    l = solve(dp,a,left,right-1,turn+1) + a[right]
    r = solve(dp,a,left+1,right,turn+1) + a[left]
    if l < r
      dp[left][right] = r
    else
      dp[left][right] = l
    end
  else
    # jiro
    l = solve(dp,a,left,right-1,turn+1) - a[right]
    r = solve(dp,a,left+1,right,turn+1) - a[left]
    if l < r
      dp[left][right] = l
    else
      dp[left][right] = r
    end
  end

  dp[left][right]
end

N=gets.to_i
a=gets.chomp.split.map(&:to_i)
dp=Array.new(N).map{Array.new(N,nil)}

solve(dp,a,0,N-1,1)

puts dp[0][N-1]