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<p>给定一个整数数组 <code>nums</code>&nbsp;和一个整数目标值 <code>target</code>,请你在该数组中找出 <strong>和为目标值 </strong><em><code>target</code></em>&nbsp; 的那&nbsp;<strong>两个</strong>&nbsp;整数,并返回它们的数组下标。</p>
<p>你可以假设每种输入只会对应一个答案。但是,数组中同一个元素在答案里不能重复出现。</p>
<p>你可以按任意顺序返回答案。</p>
<p>&nbsp;</p>
<p><strong class="example">示例 1</strong></p>
<pre>
<strong>输入:</strong>nums = [2,7,11,15], target = 9
<strong>输出:</strong>[0,1]
<strong>解释:</strong>因为 nums[0] + nums[1] == 9 ,返回 [0, 1] 。
</pre>
<p><strong class="example">示例 2</strong></p>
<pre>
<strong>输入:</strong>nums = [3,2,4], target = 6
<strong>输出:</strong>[1,2]
</pre>
<p><strong class="example">示例 3</strong></p>
<pre>
<strong>输入:</strong>nums = [3,3], target = 6
<strong>输出:</strong>[0,1]
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>2 &lt;= nums.length &lt;= 10<sup>4</sup></code></li>
<li><code>-10<sup>9</sup> &lt;= nums[i] &lt;= 10<sup>9</sup></code></li>
<li><code>-10<sup>9</sup> &lt;= target &lt;= 10<sup>9</sup></code></li>
<li><strong>只会存在一个有效答案</strong></li>
</ul>
<p>&nbsp;</p>
<p><strong>进阶:</strong>你可以想出一个时间复杂度小于 <code>O(n<sup>2</sup>)</code> 的算法吗?</p>