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            "title": "Minimum Deletions to Make Character Frequencies Unique",
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            "content": "<p>A string <code>s</code> is called <strong>good</strong> if there are no two different characters in <code>s</code> that have the same <strong>frequency</strong>.</p>\n\n<p>Given a string <code>s</code>, return<em> the <strong>minimum</strong> number of characters you need to delete to make </em><code>s</code><em> <strong>good</strong>.</em></p>\n\n<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>&quot;aab&quot;</code>, the <strong>frequency</strong> of <code>&#39;a&#39;</code> is <code>2</code>, while the <strong>frequency</strong> of <code>&#39;b&#39;</code> is <code>1</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aab&quot;\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> <code>s</code> is already good.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aaabbbcc&quot;\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> You can delete two &#39;b&#39;s resulting in the good string &quot;aaabcc&quot;.\nAnother way it to delete one &#39;b&#39; and one &#39;c&#39; resulting in the good string &quot;aaabbc&quot;.</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;ceabaacb&quot;\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> You can delete both &#39;c&#39;s resulting in the good string &quot;eabaab&quot;.\nNote that we only care about characters that are still in the string at the end (i.e. frequency of 0 is ignored).\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>s</code>&nbsp;contains only lowercase English letters.</li>\n</ul>\n",
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                "As we can only delete characters, if we have multiple characters having the same frequency, we must decrease all the frequencies of them, except one.",
                "Sort the alphabet characters by their frequencies non-increasingly.",
                "Iterate on the alphabet characters, keep decreasing the frequency of the current character until it reaches a value that has not appeared before."
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