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算法题（国外版）/max-difference-you-can-get-from-changing-an-integer.html

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+<p>You are given an integer <code>num</code>. You will apply the following steps exactly <strong>two</strong> times:</p>
+
+<ul>
+	<li>Pick a digit <code>x (0 &lt;= x &lt;= 9)</code>.</li>
+	<li>Pick another digit <code>y (0 &lt;= y &lt;= 9)</code>. The digit <code>y</code> can be equal to <code>x</code>.</li>
+	<li>Replace all the occurrences of <code>x</code> in the decimal representation of <code>num</code> by <code>y</code>.</li>
+	<li>The new integer <strong>cannot</strong> have any leading zeros, also the new integer <strong>cannot</strong> be 0.</li>
+</ul>
+
+<p>Let <code>a</code> and <code>b</code> be the results of applying the operations to <code>num</code> the first and second times, respectively.</p>
+
+<p>Return <em>the max difference</em> between <code>a</code> and <code>b</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> num = 555
+<strong>Output:</strong> 888
+<strong>Explanation:</strong> The first time pick x = 5 and y = 9 and store the new integer in a.
+The second time pick x = 5 and y = 1 and store the new integer in b.
+We have now a = 999 and b = 111 and max difference = 888
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> num = 9
+<strong>Output:</strong> 8
+<strong>Explanation:</strong> The first time pick x = 9 and y = 9 and store the new integer in a.
+The second time pick x = 9 and y = 1 and store the new integer in b.
+We have now a = 9 and b = 1 and max difference = 8
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= num &lt;= 10</code><sup>8</sup></li>
+</ul>