You are given a binary array possible of length n.
Alice and Bob are playing a game that consists of n levels. Some of the levels in the game are impossible to clear while others can always be cleared. In particular, if possible[i] == 0, then the ith level is impossible to clear for both the players. A player gains 1 point on clearing a level and loses 1 point if the player fails to clear it.
At the start of the game, Alice will play some levels in the given order starting from the 0th level, after which Bob will play for the rest of the levels.
Alice wants to know the minimum number of levels she should play to gain more points than Bob, if both players play optimally to maximize their points.
\n\nReturn the minimum number of levels Alice should play to gain more points. If this is not possible, return -1.
Note that each player must play at least 1 level.
\n
Example 1:
\n\nInput: possible = [1,0,1,0]
\n\nOutput: 1
\n\nExplanation:
\n\nLet's look at all the levels that Alice can play up to:
\n\nAlice must play a minimum of 1 level to gain more points.
\nExample 2:
\n\nInput: possible = [1,1,1,1,1]
\n\nOutput: 3
\n\nExplanation:
\n\nLet's look at all the levels that Alice can play up to:
\n\nAlice must play a minimum of 3 levels to gain more points.
\nExample 3:
\n\nInput: possible = [0,0]
\n\nOutput: -1
\n\nExplanation:
\n\nThe only possible way is for both players to play 1 level each. Alice plays level 0 and loses 1 point. Bob plays level 1 and loses 1 point. As both players have equal points, Alice can't gain more points than Bob.
\n\n
Constraints:
\n\n2 <= n == possible.length <= 105possible[i] is either 0 or 1.给你一个长度为 n 的二进制数组 possible 。
Alice 和 Bob 正在玩一个有 n 个关卡的游戏，游戏中有一些关卡是 困难 模式，其他的关卡是 简单 模式。如果 possible[i] == 0 ，那么第 i 个关卡是 困难 模式，两个玩家 都不可能 通过。一个玩家通过一个简单模式的关卡可以获得 1 分，遇到困难模式的关卡将失去 1 分。
游戏的一开始，Alice 将从第 0 级开始 按顺序 完成一些关卡，然后 Bob 会完成剩下的所有关卡。
假设两名玩家都采取最优策略，目的是 最大化 自己的得分，Alice 想知道自己 最少 需要完成多少个关卡，才能获得比 Bob 更多的分数。
\n\n请你返回 Alice 获得比 Bob 更多的分数所需要完成的 最少 关卡数目，如果 无法 达成，那么返回 -1 。
注意，每个玩家都至少需要完成 1 个关卡。
\n\n
示例 1：
\n\n输入：possible = [1,0,1,0]
\n\n输出：1
\n\n解释：
\n\n我们来看一下 Alice 可以完成的关卡数目：
\n\nAlice 需要完成至少一个关卡获得更多的分数。
\n示例 2：
\n\n输入：possible = [1,1,1,1,1]
\n\n输出：3
\n\n解释：
\n\n我们来看一下 Alice 可以完成的关卡数目：
\n\nAlice 需要完成至少三个关卡获得更多的分数。
\n示例 3：
\n\n输入：possible = [0,0]
\n\n输出：-1
\n\n解释：
\n\n两名玩家只能各完成 1 个关卡，Alice 完成关卡 0 得到 -1 分，Bob 完成关卡 1 得到 -1 分。两名玩家得分相同，所以 Alice 无法得到更多分数。
\n\n\n
提示：
\n\n2 <= n == possible.length <= 105possible[i] 要么是 0 要么是 1 。0 in possible array into -1.",
"We need to find the shortest non-empty prefix of the new possible array such that the sum of elements in it is strictly larger than the remaining part."
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