{ "data": { "question": { "questionId": "2602", "questionFrontendId": "2511", "categoryTitle": "Algorithms", "boundTopicId": 2029964, "title": "Maximum Enemy Forts That Can Be Captured", "titleSlug": "maximum-enemy-forts-that-can-be-captured", "content": "

You are given a 0-indexed integer array forts of length n representing the positions of several forts. forts[i] can be -1, 0, or 1 where:

\n\n\n\n

Now you have decided to move your army from one of your forts at position i to an empty position j such that:

\n\n\n\n

While moving the army, all the enemy forts that come in the way are captured.

\n\n

Return the maximum number of enemy forts that can be captured. In case it is impossible to move your army, or you do not have any fort under your command, return 0.

\n\n

 

\n

Example 1:

\n\n
\nInput: forts = [1,0,0,-1,0,0,0,0,1]\nOutput: 4\nExplanation:\n- Moving the army from position 0 to position 3 captures 2 enemy forts, at 1 and 2.\n- Moving the army from position 8 to position 3 captures 4 enemy forts.\nSince 4 is the maximum number of enemy forts that can be captured, we return 4.\n
\n\n

Example 2:

\n\n
\nInput: forts = [0,0,1,-1]\nOutput: 0\nExplanation: Since no enemy fort can be captured, 0 is returned.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "最多可以摧毁的敌人城堡数目", "translatedContent": "

给你一个长度为 n ，下标从 0 开始的整数数组 forts ，表示一些城堡。forts[i] 可以是 -1 ，0 或者 1 ，其中：

\n\n\n\n

现在，你需要决定，将你的军队从某个你控制的城堡位置 i 移动到一个空的位置 j ，满足：

\n\n\n\n

当军队移动时，所有途中经过的敌人城堡都会被 摧毁 。

\n\n

请你返回 最多 可以摧毁的敌人城堡数目。如果 无法 移动你的军队，或者没有你控制的城堡，请返回 0 。

\n\n

 

\n\n

示例 1：

\n\n
输入：forts = [1,0,0,-1,0,0,0,0,1]\n输出：4\n解释：\n- 将军队从位置 0 移动到位置 3 ，摧毁 2 个敌人城堡，位置分别在 1 和 2 。\n- 将军队从位置 8 移动到位置 3 ，摧毁 4 个敌人城堡。\n4 是最多可以摧毁的敌人城堡数目，所以我们返回 4 。\n
\n\n

示例 2：

\n\n
输入：forts = [0,0,1,-1]\n输出：0\n解释：由于无法摧毁敌人的城堡，所以返回 0 。\n
\n\n

 

\n\n

提示：

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