contains-duplicate

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Contains Duplicate

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containsDuplicate

Given an integer array <code>nums</code>, return <code>true</code> if any value appears at least twice in the array, and return <code>false</code> if every element is distinct.

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

<ul>
	<li><code>1 &lt;= nums.length &lt;= 105</code></li>
	<li><code>-109 &lt;= nums[i] &lt;= 109</code></li>
</ul>

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