mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-10-12 17:05:15 +08:00
38 lines
1.3 KiB
HTML
38 lines
1.3 KiB
HTML
<p>Given a <strong>non-empty</strong> array of integers <code>nums</code>, every element appears <em>twice</em> except for one. Find that single one.</p>
|
|
|
|
<p>You must implement a solution with a linear runtime complexity and use only constant extra space.</p>
|
|
|
|
<p> </p>
|
|
<p><strong class="example">Example 1:</strong></p>
|
|
|
|
<div class="example-block">
|
|
<p><strong>Input:</strong> <span class="example-io">nums = [2,2,1]</span></p>
|
|
|
|
<p><strong>Output:</strong> <span class="example-io">1</span></p>
|
|
</div>
|
|
|
|
<p><strong class="example">Example 2:</strong></p>
|
|
|
|
<div class="example-block">
|
|
<p><strong>Input:</strong> <span class="example-io">nums = [4,1,2,1,2]</span></p>
|
|
|
|
<p><strong>Output:</strong> <span class="example-io">4</span></p>
|
|
</div>
|
|
|
|
<p><strong class="example">Example 3:</strong></p>
|
|
|
|
<div class="example-block">
|
|
<p><strong>Input:</strong> <span class="example-io">nums = [1]</span></p>
|
|
|
|
<p><strong>Output:</strong> <span class="example-io">1</span></p>
|
|
</div>
|
|
|
|
<p> </p>
|
|
<p><strong>Constraints:</strong></p>
|
|
|
|
<ul>
|
|
<li><code>1 <= nums.length <= 3 * 10<sup>4</sup></code></li>
|
|
<li><code>-3 * 10<sup>4</sup> <= nums[i] <= 3 * 10<sup>4</sup></code></li>
|
|
<li>Each element in the array appears twice except for one element which appears only once.</li>
|
|
</ul>
|