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36 lines
1.7 KiB
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36 lines
1.7 KiB
HTML
<p>Given a string <code>paragraph</code> and a string array of the banned words <code>banned</code>, return <em>the most frequent word that is not banned</em>. It is <strong>guaranteed</strong> there is <strong>at least one word</strong> that is not banned, and that the answer is <strong>unique</strong>.</p>
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<p>The words in <code>paragraph</code> are <strong>case-insensitive</strong> and the answer should be returned in <strong>lowercase</strong>.</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> paragraph = "Bob hit a ball, the hit BALL flew far after it was hit.", banned = ["hit"]
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<strong>Output:</strong> "ball"
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<strong>Explanation:</strong>
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"hit" occurs 3 times, but it is a banned word.
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"ball" occurs twice (and no other word does), so it is the most frequent non-banned word in the paragraph.
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Note that words in the paragraph are not case sensitive,
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that punctuation is ignored (even if adjacent to words, such as "ball,"),
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and that "hit" isn't the answer even though it occurs more because it is banned.
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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> paragraph = "a.", banned = []
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<strong>Output:</strong> "a"
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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 <= paragraph.length <= 1000</code></li>
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<li>paragraph consists of English letters, space <code>' '</code>, or one of the symbols: <code>"!?',;."</code>.</li>
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<li><code>0 <= banned.length <= 100</code></li>
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<li><code>1 <= banned[i].length <= 10</code></li>
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<li><code>banned[i]</code> consists of only lowercase English letters.</li>
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</ul>
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