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leetcode-cn/problem (Chinese)/组合 [combinations].html Normal file
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<p>给定两个整数 <code>n</code> 和 <code>k</code>，返回范围 <code>[1, n]</code> 中所有可能的 <code>k</code> 个数的组合。</p>
<p>你可以按 <strong>任何顺序</strong> 返回答案。</p>
<p> </p>
<p><strong>示例 1：</strong></p>
<pre>
<strong>输入：</strong>n = 4, k = 2
<strong>输出：</strong>
[
[2,4],
[3,4],
[2,3],
[1,2],
[1,3],
[1,4],
]</pre>
<p><strong>示例 2：</strong></p>
<pre>
<strong>输入：</strong>n = 1, k = 1
<strong>输出：</strong>[[1]]</pre>
<p> </p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 <= n <= 20</code></li>
<li><code>1 <= k <= n</code></li>
</ul>