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+<h2>738. Monotone Increasing Digits</h2><h3>Medium</h3><hr><div><p>
+Given a non-negative integer <code>N</code>, find the largest number that is less than or equal to <code>N</code> with monotone increasing digits.
+</p><p>
+(Recall that an integer has <i>monotone increasing digits</i> if and only if each pair of adjacent digits <code>x</code> and <code>y</code> satisfy <code>x &lt;= y</code>.)
+</p><p>
+
+</p><p><b>Example 1:</b><br>
+</p><pre><b>Input:</b> N = 10
+<b>Output:</b> 9
+</pre>
+<p></p>
+
+<p><b>Example 2:</b><br>
+</p><pre><b>Input:</b> N = 1234
+<b>Output:</b> 1234
+</pre>
+<p></p>
+
+<p><b>Example 3:</b><br>
+</p><pre><b>Input:</b> N = 332
+<b>Output:</b> 299
+</pre>
+<p></p>
+
+<p><b>Note:</b>
+<code>N</code> is an integer in the range <code>[0, 10^9]</code>.
+</p></div>