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41 lines
1.9 KiB
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41 lines
1.9 KiB
HTML
<p>Given two string arrays <code>words1</code> and <code>words2</code>, return <em>the number of strings that appear <strong>exactly once</strong> in <b>each</b> of the two arrays.</em></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> words1 = ["leetcode","is","amazing","as","is"], words2 = ["amazing","leetcode","is"]
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<strong>Output:</strong> 2
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<strong>Explanation:</strong>
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- "leetcode" appears exactly once in each of the two arrays. We count this string.
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- "amazing" appears exactly once in each of the two arrays. We count this string.
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- "is" appears in each of the two arrays, but there are 2 occurrences of it in words1. We do not count this string.
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- "as" appears once in words1, but does not appear in words2. We do not count this string.
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Thus, there are 2 strings that appear exactly once in each of the two arrays.
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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> words1 = ["b","bb","bbb"], words2 = ["a","aa","aaa"]
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<strong>Output:</strong> 0
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<strong>Explanation:</strong> There are no strings that appear in each of the two arrays.
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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> words1 = ["a","ab"], words2 = ["a","a","a","ab"]
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<strong>Output:</strong> 1
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<strong>Explanation:</strong> The only string that appears exactly once in each of the two arrays is "ab".
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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 <= words1.length, words2.length <= 1000</code></li>
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<li><code>1 <= words1[i].length, words2[j].length <= 30</code></li>
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<li><code>words1[i]</code> and <code>words2[j]</code> consists only of lowercase English letters.</li>
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</ul>
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