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算法题/number-of-ways-to-separate-numbers.html

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+<p>You wrote down many <strong>positive</strong> integers in a string called <code>num</code>. However, you realized that you forgot to add commas to seperate the different numbers. You remember that the list of integers was <strong>non-decreasing</strong> and that <strong>no</strong> integer had leading zeros.</p>
+
+<p>Return <em>the <strong>number of possible lists of integers</strong> that you could have written down to get the string </em><code>num</code>. Since the answer may be large, return it <strong>modulo</strong> <code>10<sup>9</sup> + 7</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> num = &quot;327&quot;
+<strong>Output:</strong> 2
+<strong>Explanation:</strong> You could have written down the numbers:
+3, 27
+327
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> num = &quot;094&quot;
+<strong>Output:</strong> 0
+<strong>Explanation:</strong> No numbers can have leading zeros and all numbers must be positive.
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> num = &quot;0&quot;
+<strong>Output:</strong> 0
+<strong>Explanation:</strong> No numbers can have leading zeros and all numbers must be positive.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= num.length &lt;= 3500</code></li>
+	<li><code>num</code> consists of digits <code>&#39;0&#39;</code> through <code>&#39;9&#39;</code>.</li>
+</ul>