single-number

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Single Number

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singleNumber

Given a non-empty&nbsp;array of integers <code>nums</code>, every element appears twice except for one. Find that single one.

You must&nbsp;implement a solution with a linear runtime complexity and use&nbsp;only constant&nbsp;extra space.

&nbsp;
Example 1:
<pre>Input: nums = [2,2,1]
Output: 1
</pre>Example 2:
<pre>Input: nums = [4,1,2,1,2]
Output: 4
</pre>Example 3:
<pre>Input: nums = [1]
Output: 1
</pre>
&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= nums.length &lt;= 3 * 104</code></li>
	<li><code>-3 * 104 &lt;= nums[i] &lt;= 3 * 104</code></li>
	<li>Each element in the array appears twice except for one element which appears only once.</li>
</ul>

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