add leetcode problem-cn part2

算法题（国内版）/problem (English)/移除重复节点(English) [remove-duplicate-node-lcci].html

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+<p>Write code to remove duplicates from an unsorted linked list.</p>
+
+<p><strong>Example1:</strong></p>
+
+<pre>
+<strong> Input</strong>: [1, 2, 3, 3, 2, 1]
+<strong> Output</strong>: [1, 2, 3]
+</pre>
+
+<p><strong>Example2:</strong></p>
+
+<pre>
+<strong> Input</strong>: [1, 1, 1, 1, 2]
+<strong> Output</strong>: [1, 2]
+</pre>
+
+<p><strong>Note: </strong></p>
+
+<ol>
+	<li>The length of the list is within the range[0, 20000].</li>
+	<li>The values of the list elements are within the range [0, 20000].</li>
+</ol>
+
+<p><strong>Follow Up: </strong></p>
+
+<p>How would you solve this problem if a temporary buffer is not allowed?</p>