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            "title": "Maximum Number of Vowels in a Substring of Given Length",
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            "content": "<p>Given a string <code>s</code> and an integer <code>k</code>, return <em>the maximum number of vowel letters in any substring of </em><code>s</code><em> with length </em><code>k</code>.</p>\n\n<p><strong>Vowel letters</strong> in English are <code>&#39;a&#39;</code>, <code>&#39;e&#39;</code>, <code>&#39;i&#39;</code>, <code>&#39;o&#39;</code>, and <code>&#39;u&#39;</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;abciiidef&quot;, k = 3\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The substring &quot;iii&quot; contains 3 vowel letters.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aeiou&quot;, k = 2\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> Any substring of length 2 contains 2 vowels.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;leetcode&quot;, k = 3\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> &quot;lee&quot;, &quot;eet&quot; and &quot;ode&quot; contain 2 vowels.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>s</code> consists of lowercase English letters.</li>\n\t<li><code>1 &lt;= k &lt;= s.length</code></li>\n</ul>\n",
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                    "code": "class Solution(object):\n    def maxVowels(self, s, k):\n        \"\"\"\n        :type s: str\n        :type k: int\n        :rtype: int\n        \"\"\"\n        ",
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                    "code": "/**\n * @param {string} s\n * @param {number} k\n * @return {number}\n */\nvar maxVowels = function(s, k) {\n    \n};",
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                    "code": "impl Solution {\n    pub fn max_vowels(s: String, k: i32) -> i32 {\n        \n    }\n}",
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                "Keep a window of size k and maintain the number of vowels in it.",
                "Keep moving the window and update the number of vowels while moving. Answer is max number of vowels of any window."
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