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50 lines
2.1 KiB
HTML
50 lines
2.1 KiB
HTML
<p>Given an array of strings <code>words</code>, return <em>the words that can be typed using letters of the alphabet on only one row of American keyboard like the image below</em>.</p>
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<p><strong>Note</strong> that the strings are <strong>case-insensitive</strong>, both lowercased and uppercased of the same letter are treated as if they are at the same row.</p>
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<p>In the <strong>American keyboard</strong>:</p>
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<ul>
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<li>the first row consists of the characters <code>"qwertyuiop"</code>,</li>
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<li>the second row consists of the characters <code>"asdfghjkl"</code>, and</li>
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<li>the third row consists of the characters <code>"zxcvbnm"</code>.</li>
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</ul>
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<img alt="" src="https://assets.leetcode.com/uploads/2018/10/12/keyboard.png" style="width: 800px; max-width: 600px; height: 267px;" />
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">words = ["Hello","Alaska","Dad","Peace"]</span></p>
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<p><strong>Output:</strong> <span class="example-io">["Alaska","Dad"]</span></p>
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<p><strong>Explanation:</strong></p>
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<p>Both <code>"a"</code> and <code>"A"</code> are in the 2nd row of the American keyboard due to case insensitivity.</p>
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</div>
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<p><strong class="example">Example 2:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">words = ["omk"]</span></p>
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<p><strong>Output:</strong> <span class="example-io">[]</span></p>
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</div>
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<p><strong class="example">Example 3:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">words = ["adsdf","sfd"]</span></p>
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<p><strong>Output:</strong> <span class="example-io">["adsdf","sfd"]</span></p>
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</div>
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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 <= words.length <= 20</code></li>
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<li><code>1 <= words[i].length <= 100</code></li>
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<li><code>words[i]</code> consists of English letters (both lowercase and uppercase). </li>
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</ul>
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