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38 lines
1.3 KiB
HTML
<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>
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<p><strong>Vowel letters</strong> in English are <code>'a'</code>, <code>'e'</code>, <code>'i'</code>, <code>'o'</code>, and <code>'u'</code>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> s = "abciiidef", k = 3
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<strong>Output:</strong> 3
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<strong>Explanation:</strong> The substring "iii" contains 3 vowel letters.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> s = "aeiou", k = 2
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> Any substring of length 2 contains 2 vowels.
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</pre>
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<p><strong>Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> s = "leetcode", k = 3
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> "lee", "eet" and "ode" contain 2 vowels.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= s.length <= 10<sup>5</sup></code></li>
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<li><code>s</code> consists of lowercase English letters.</li>
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<li><code>1 <= k <= s.length</code></li>
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</ul>
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