<p>You are given an integer <code>num</code>. You can swap two digits at most once to get the maximum valued number.</p>

<p>Return <em>the maximum valued number you can get</em>.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input:</strong> num = 2736
<strong>Output:</strong> 7236
<strong>Explanation:</strong> Swap the number 2 and the number 7.
</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>
<strong>Input:</strong> num = 9973
<strong>Output:</strong> 9973
<strong>Explanation:</strong> No swap.
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>0 &lt;= num &lt;= 10<sup>8</sup></code></li>
</ul>

class Solution:
    def maximumSwap(self, num: int) -> int:
        str_num = str(num)
        ans = num
        for i in range(len(str_num)):
            for j in range(i + 1, len(str_num)):
                new_num = [i for i in str_num]
                new_num[i], new_num[j] = new_num[j], new_num[i]
                new_num = int("".join(new_num))
                ans = max(ans, new_num)
        return ans
        
16200