contains-duplicate-ii

Contains Duplicate II

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containsNearbyDuplicate

Given an integer array <code>nums</code> and an integer <code>k</code>, return <code>true</code> if there are two distinct indices <code>i</code> and <code>j</code> in the array such that <code>nums[i] == nums[j]</code> and <code>abs(i - j) &lt;= k</code>.

&nbsp;
Example 1:

<pre>
Input: nums = [1,2,3,1], k = 3
Output: true
</pre>

Example 2:

<pre>
Input: nums = [1,0,1,1], k = 1
Output: true
</pre>

Example 3:

<pre>
Input: nums = [1,2,3,1,2,3], k = 2
Output: false
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= nums.length &lt;= 105</code></li>
	<li><code>-109 &lt;= nums[i] &lt;= 109</code></li>
	<li><code>0 &lt;= k &lt;= 105</code></li>
</ul>

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