Alice and Bob continue their games with piles of stones. There are a number of piles arranged in a row, and each pile has a positive integer number of stones piles[i]. The objective of the game is to end with the most stones.
Alice and Bob take turns, with Alice starting first. Initially, M = 1.
On each player's turn, that player can take all the stones in the first X remaining piles, where 1 <= X <= 2M. Then, we set M = max(M, X).
The game continues until all the stones have been taken.
\n\nAssuming Alice and Bob play optimally, return the maximum number of stones Alice can get.
\n\n\n
Example 1:
\n\n\nInput: piles = [2,7,9,4,4]\nOutput: 10\nExplanation: If Alice takes one pile at the beginning, Bob takes two piles, then Alice takes 2 piles again. Alice can get 2 + 4 + 4 = 10 piles in total. If Alice takes two piles at the beginning, then Bob can take all three piles left. In this case, Alice get 2 + 7 = 9 piles in total. So we return 10 since it's larger. \n\n\n
Example 2:
\n\n\nInput: piles = [1,2,3,4,5,100]\nOutput: 104\n\n\n
\n
Constraints:
\n\n1 <= piles.length <= 1001 <= piles[i] <= 104爱丽丝和鲍勃继续他们的石子游戏。许多堆石子 排成一行，每堆都有正整数颗石子 piles[i]。游戏以谁手中的石子最多来决出胜负。
爱丽丝和鲍勃轮流进行，爱丽丝先开始。最初，M = 1。
在每个玩家的回合中，该玩家可以拿走剩下的 前 X 堆的所有石子，其中 1 <= X <= 2M。然后，令 M = max(M, X)。
游戏一直持续到所有石子都被拿走。
\n\n假设爱丽丝和鲍勃都发挥出最佳水平，返回爱丽丝可以得到的最大数量的石头。
\n\n\n\n
示例 1：
\n\n\n输入：piles = [2,7,9,4,4]\n输出：10\n解释：如果一开始Alice取了一堆，Bob取了两堆，然后Alice再取两堆。爱丽丝可以得到2 + 4 + 4 = 10堆。如果Alice一开始拿走了两堆，那么Bob可以拿走剩下的三堆。在这种情况下，Alice得到2 + 7 = 9堆。返回10，因为它更大。\n\n\n
示例 2:
\n\n\n输入：piles = [1,2,3,4,5,100]\n输出：104\n\n\n
\n\n
提示：
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