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add leetcode problem-cn part2

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算法题（国内版）/problem (English)/链表求和(English) [sum-lists-lcci].html Normal file
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<p>You have two numbers represented by a linked list, where each node contains a single digit. The digits are stored in reverse order, such that the 1&#39;s digit is at the head of the list. Write a function that adds the two numbers and returns the sum as a linked list.</p>
<p>&nbsp;</p>
<p><strong>Example: </strong></p>
<pre>
<strong>Input: </strong>(7 -&gt; 1 -&gt; 6) + (5 -&gt; 9 -&gt; 2). That is, 617 + 295.
<strong>Output: </strong>2 -&gt; 1 -&gt; 9. That is, 912.
</pre>
<p><strong>Follow Up:&nbsp;</strong>Suppose the digits are stored in forward order. Repeat the above problem.</p>
<p><strong>Example: </strong></p>
<pre>
<strong>Input: </strong>(6 -&gt; 1 -&gt; 7) + (2 -&gt; 9 -&gt; 5). That is, 617 + 295.
<strong>Output: </strong>9 -&gt; 1 -&gt; 2. That is, 912.
</pre>