maximum-swap.md

<p>
Given a non-negative integer, you could swap two digits <b>at most</b> once to get the maximum valued number. Return the maximum valued number you could get.
</p>

<p><b>Example 1:</b><br />
<pre>
<b>Input:</b> 2736
<b>Output:</b> 7236
<b>Explanation:</b> Swap the number 2 and the number 7.
</pre>
</p>

<p><b>Example 2:</b><br />
<pre>
<b>Input:</b> 9973
<b>Output:</b> 9973
<b>Explanation:</b> No swap.
</pre>
</p>


<p><b>Note:</b><br>
<ol>
<li>The given number is in the range [0, 10<sup>8</sup>]</li>
</ol>
</p>