mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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175 lines
17 KiB
JSON
175 lines
17 KiB
JSON
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"title": "Maximum Enemy Forts That Can Be Captured",
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"content": "<p>You are given a <strong>0-indexed</strong> integer array <code>forts</code> of length <code>n</code> representing the positions of several forts. <code>forts[i]</code> can be <code>-1</code>, <code>0</code>, or <code>1</code> where:</p>\n\n<ul>\n\t<li><code>-1</code> represents there is <strong>no fort</strong> at the <code>i<sup>th</sup></code> position.</li>\n\t<li><code>0</code> indicates there is an <strong>enemy</strong> fort at the <code>i<sup>th</sup></code> position.</li>\n\t<li><code>1</code> indicates the fort at the <code>i<sup>th</sup></code> the position is under your command.</li>\n</ul>\n\n<p>Now you have decided to move your army from one of your forts at position <code>i</code> to an empty position <code>j</code> such that:</p>\n\n<ul>\n\t<li><code>0 <= i, j <= n - 1</code></li>\n\t<li>The army travels over enemy forts <strong>only</strong>. Formally, for all <code>k</code> where <code>min(i,j) < k < max(i,j)</code>, <code>forts[k] == 0.</code></li>\n</ul>\n\n<p>While moving the army, all the enemy forts that come in the way are <strong>captured</strong>.</p>\n\n<p>Return<em> the <strong>maximum</strong> number of enemy forts that can be captured</em>. In case it is <strong>impossible</strong> to move your army, or you do not have any fort under your command, return <code>0</code><em>.</em></p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> forts = [1,0,0,-1,0,0,0,0,1]\n<strong>Output:</strong> 4\n<strong>Explanation:</strong>\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</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> forts = [0,0,1,-1]\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> Since no enemy fort can be captured, 0 is returned.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= forts.length <= 1000</code></li>\n\t<li><code>-1 <= forts[i] <= 1</code></li>\n</ul>\n",
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"code": "class Solution {\npublic:\n int captureForts(vector<int>& forts) {\n \n }\n};",
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"code": "class Solution(object):\n def captureForts(self, forts):\n \"\"\"\n :type forts: List[int]\n :rtype: int\n \"\"\"\n ",
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"code": "/**\n * @param {number[]} forts\n * @return {number}\n */\nvar captureForts = function(forts) {\n \n};",
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"code": "# @param {Integer[]} forts\n# @return {Integer}\ndef capture_forts(forts)\n \nend",
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"code": "class Solution {\n func captureForts(_ forts: [Int]) -> Int {\n \n }\n}",
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"code": "object Solution {\n def captureForts(forts: Array[Int]): Int = {\n \n }\n}",
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"code": "impl Solution {\n pub fn capture_forts(forts: Vec<i32>) -> i32 {\n \n }\n}",
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"code": "class Solution {\n\n /**\n * @param Integer[] $forts\n * @return Integer\n */\n function captureForts($forts) {\n \n }\n}",
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"code": "function captureForts(forts: number[]): number {\n\n};",
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"hints": [
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"For each fort under your command, check if you can move the army from here.",
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"If yes, find the closest empty positions satisfying all criteria.",
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"How can two-pointers be used to solve this problem optimally?"
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