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存量题库数据更新
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<p>The <strong>frequency</strong> of a character in a string is the number of times it appears in the string. For example, in the string <code>"aab"</code>, the <strong>frequency</strong> of <code>'a'</code> is <code>2</code>, while the <strong>frequency</strong> of <code>'b'</code> is <code>1</code>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> s = "aab"
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<strong>Explanation:</strong> <code>s</code> is already good.
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</pre>
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<p><strong>Example 2:</strong></p>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> s = "aaabbbcc"
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<strong>Explanation:</strong> You can delete two 'b's resulting in the good string "aaabcc".
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Another way it to delete one 'b' and one 'c' resulting in the good string "aaabbc".</pre>
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<p><strong>Example 3:</strong></p>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> s = "ceabaacb"
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