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<p>给定一个整数数组 <code>nums</code> 和一个整数 <code>k</code>&nbsp;,请返回其中出现频率前 <code>k</code> 高的元素。可以按 <strong>任意顺序</strong> 返回答案。</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入: </strong>nums = [1,1,1,2,2,3], k = 2
<strong>输出: </strong>[1,2]
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入: </strong>nums = [1], k = 1
<strong>输出: </strong>[1]</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>
<li><code>k</code> 的取值范围是 <code>[1, 数组中不相同的元素的个数]</code></li>
<li>题目数据保证答案唯一,换句话说,数组中前 <code>k</code> 个高频元素的集合是唯一的</li>
</ul>
<p>&nbsp;</p>
<p><strong>进阶:</strong>所设计算法的时间复杂度 <strong>必须</strong> 优于 <code>O(n log n)</code> ,其中 <code>n</code><em>&nbsp;</em>是数组大小。</p>
<p>&nbsp;</p>
<p><meta charset="UTF-8" />注意:本题与主站 347&nbsp;题相同:<a href="https://leetcode-cn.com/problems/top-k-frequent-elements/">https://leetcode-cn.com/problems/top-k-frequent-elements/</a></p>