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leetcode-problemset/leetcode-cn/problem (English)/两句话中的不常见单词(English) [uncommon-words-from-two-sentences].html

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<p>A <strong>sentence</strong> is a string of single-space separated words where each word consists only of lowercase letters.</p>
<p>A word is <strong>uncommon</strong> if it appears exactly once in one of the sentences, and <strong>does not appear</strong> in the other sentence.</p>
<p>Given two <strong>sentences</strong> <code>s1</code> and <code>s2</code>, return <em>a list of all the <strong>uncommon words</strong></em>. You may return the answer in <strong>any order</strong>.</p>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s1 = &quot;this apple is sweet&quot;, s2 = &quot;this apple is sour&quot;</span></p>
<p><strong>Output:</strong> <span class="example-io">[&quot;sweet&quot;,&quot;sour&quot;]</span></p>
<p><strong>Explanation:</strong></p>
<p>The word <code>&quot;sweet&quot;</code> appears only in <code>s1</code>, while the word <code>&quot;sour&quot;</code> appears only in <code>s2</code>.</p>
</div>
<p><strong class="example">Example 2:</strong></p>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s1 = &quot;apple apple&quot;, s2 = &quot;banana&quot;</span></p>
<p><strong>Output:</strong> <span class="example-io">[&quot;banana&quot;]</span></p>
</div>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;= s1.length, s2.length &lt;= 200</code></li>
<li><code>s1</code> and <code>s2</code> consist of lowercase English letters and spaces.</li>
<li><code>s1</code> and <code>s2</code> do not have leading or trailing spaces.</li>
<li>All the words in <code>s1</code> and <code>s2</code> are separated by a single space.</li>
</ul>