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3442-maximum-difference-between-even-and-odd-frequency-i/README.md

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+<h2><a href="https://leetcode.com/problems/maximum-difference-between-even-and-odd-frequency-i/?envType=daily-question&envId=2025-06-10">3442. Maximum Difference Between Even and Odd Frequency I</a></h2><h3>Easy</h3><hr><p>You are given a string <code>s</code> consisting of lowercase English letters.</p>
+
+<p>Your task is to find the <strong>maximum</strong> difference <code>diff = freq(a<sub>1)</sub> - freq(a<sub>2</sub>)</code> between the frequency of characters <code>a<sub>1</sub></code> and <code>a<sub>2</sub></code> in the string such that:</p>
+
+<ul>
+	<li><code>a<sub>1</sub></code> has an <strong>odd frequency</strong> in the string.</li>
+	<li><code>a<sub>2</sub></code> has an <strong>even frequency</strong> in the string.</li>
+</ul>
+
+<p>Return this <strong>maximum</strong> difference.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">s = &quot;aaaaabbc&quot;</span></p>
+
+<p><strong>Output:</strong> 3</p>
+
+<p><strong>Explanation:</strong></p>
+
+<ul>
+	<li>The character <code>&#39;a&#39;</code> has an <strong>odd frequency</strong> of <code><font face="monospace">5</font></code><font face="monospace">,</font> and <code>&#39;b&#39;</code> has an <strong>even frequency</strong> of <code><font face="monospace">2</font></code>.</li>
+	<li>The maximum difference is <code>5 - 2 = 3</code>.</li>
+</ul>
+</div>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">s = &quot;abcabcab&quot;</span></p>
+
+<p><strong>Output:</strong> 1</p>
+
+<p><strong>Explanation:</strong></p>
+
+<ul>
+	<li>The character <code>&#39;a&#39;</code> has an <strong>odd frequency</strong> of <code><font face="monospace">3</font></code><font face="monospace">,</font> and <code>&#39;c&#39;</code> has an <strong>even frequency</strong> of <font face="monospace">2</font>.</li>
+	<li>The maximum difference is <code>3 - 2 = 1</code>.</li>
+</ul>
+</div>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>3 &lt;= s.length &lt;= 100</code></li>
+	<li><code>s</code> consists only of lowercase English letters.</li>
+	<li><code>s</code> contains at least one character with an odd frequency and one with an even frequency.</li>
+</ul>