buddy-strings.md

<p>Given two strings <code>A</code> and <code>B</code>&nbsp;of lowercase letters, return <code>true</code> if and only if we&nbsp;can swap two letters in <code>A</code> so that the result equals <code>B</code>.</p>

<p>&nbsp;</p>

<p><strong>Example 1:</strong></p>

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<pre>
<strong>Input: </strong>A = <span id="example-input-1-1">&quot;ab&quot;</span>, B = <span id="example-input-1-2">&quot;ba&quot;</span>
<strong>Output: </strong><span id="example-output-1">true</span>
</pre>

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<p><strong>Example 2:</strong></p>

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<strong>Input: </strong>A = <span id="example-input-2-1">&quot;ab&quot;</span>, B = <span id="example-input-2-2">&quot;ab&quot;</span>
<strong>Output: </strong><span id="example-output-2">false</span>
</pre>

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<p><strong>Example 3:</strong></p>

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<strong>Input: </strong>A = <span id="example-input-3-1">&quot;aa&quot;</span>, B = <span id="example-input-3-2">&quot;aa&quot;</span>
<strong>Output: </strong><span id="example-output-3">true</span>
</pre>

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<p><strong>Example 4:</strong></p>

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<strong>Input: </strong>A = <span id="example-input-4-1">&quot;aaaaaaabc&quot;</span>, B = <span id="example-input-4-2">&quot;aaaaaaacb&quot;</span>
<strong>Output: </strong><span id="example-output-4">true</span>
</pre>

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<p><strong>Example 5:</strong></p>

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<strong>Input: </strong>A = <span id="example-input-5-1">&quot;&quot;</span>, B = <span id="example-input-5-2">&quot;aa&quot;</span>
<strong>Output: </strong><span id="example-output-5">false</span>
</pre>

<p>&nbsp;</p>

<p><strong><span>Note:</span></strong></p>

<ol>
	<li><code>0 &lt;= A.length &lt;= 20000</code></li>
	<li><code>0 &lt;= B.length &lt;= 20000</code></li>
	<li><code>A</code> and&nbsp;<code>B</code> consist only of lowercase letters.</li>
</ol>
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