add leetcode problem-cn part2

算法题（国内版）/problem (English)/下一个数(English) [closed-number-lcci].html

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+<p>Given a positive integer, print the next smallest and the next largest number that have the same number of 1 bits in their binary representation.</p>
+
+<p><strong>Example1:</strong></p>
+
+<pre>
+<strong> Input</strong>: num = 2 (0b10)
+<strong> Output</strong>: [4, 1] ([0b100, 0b1])
+</pre>
+
+<p><strong>Example2:</strong></p>
+
+<pre>
+<strong> Input</strong>: num = 1
+<strong> Output</strong>: [2, -1]
+</pre>
+
+<p><strong>Note:</strong></p>
+
+<ol>
+	<li><code>1 &lt;= num &lt;=&nbsp;2147483647</code></li>
+	<li>If there is no next smallest or next largest number, output -1.</li>
+</ol>