The Two Sneaky Numbers of Digitville
<p>In the town of Digitville, there was a list of numbers called <code>nums</code> containing integers from <code>0</code> to <code>n - 1</code>. Each number was supposed to appear <strong>exactly once</strong> in the list, however, <strong>two</strong> mischievous numbers sneaked in an <em>additional time</em>, making the list longer than usual.<!-- notionvc: c37cfb04-95eb-4273-85d5-3c52d0525b95 --></p>

<p>As the town detective, your task is to find these two sneaky numbers. Return an array of size <strong>two</strong> containing the two numbers (in <em>any order</em>), so peace can return to Digitville.<!-- notionvc: 345db5be-c788-4828-9836-eefed31c982f --></p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">nums = [0,1,1,0]</span></p>

<p><strong>Output:</strong> <span class="example-io">[0,1]</span></p>

<p><strong>Explanation:</strong></p>

<p>The numbers 0 and 1 each appear twice in the array.</p>
</div>

<p><strong class="example">Example 2:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">nums = [0,3,2,1,3,2]</span></p>

<p><strong>Output:</strong> <span class="example-io">[2,3]</span></p>

<p><strong>Explanation: </strong></p>

<p>The numbers 2 and 3 each appear twice in the array.</p>
</div>

<p><strong class="example">Example 3:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">nums = [7,1,5,4,3,4,6,0,9,5,8,2]</span></p>

<p><strong>Output:</strong> <span class="example-io">[4,5]</span></p>

<p><strong>Explanation: </strong></p>

<p>The numbers 4 and 5 each appear twice in the array.</p>
</div>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li data-stringify-border="0" data-stringify-indent="1"><code>2 &lt;= n &lt;= 100</code></li>
	<li data-stringify-border="0" data-stringify-indent="1"><code>nums.length == n + 2</code></li>
	<li data-stringify-border="0" data-stringify-indent="1"><code data-stringify-type="code">0 &lt;= nums[i] &lt; n</code></li>
	<li data-stringify-border="0" data-stringify-indent="1">The input is generated such that <code>nums</code> contains <strong>exactly</strong> two repeated elements.</li>
</ul>
Array; Hash Table; Math
class Solution:
    def getSneakyNumbers(self, nums: List[int]) -> List[int]:
        cnt = Counter(nums)
        return [x for x, v in cnt.items() if v == 2]
