maximum-number-of-pairs-in-array

Maximum Number of Pairs in Array

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numberOfPairs

You are given a 0-indexed integer array <code>nums</code>. In one operation, you may do the following:

<ul>
	<li>Choose two integers in <code>nums</code> that are equal.</li>
	<li>Remove both integers from <code>nums</code>, forming a pair.</li>
</ul>

The operation is done on <code>nums</code> as many times as possible.

Return a 0-indexed integer array <code>answer</code> of size <code>2</code> where <code>answer[0]</code> is the number of pairs that are formed and <code>answer[1]</code> is the number of leftover integers in <code>nums</code> after doing the operation as many times as possible.

&nbsp;
Example 1:

<pre>
Input: nums = [1,3,2,1,3,2,2]
Output: [3,1]
Explanation:
Form a pair with nums[0] and nums[3] and remove them from nums. Now, nums = [3,2,3,2,2].
Form a pair with nums[0] and nums[2] and remove them from nums. Now, nums = [2,2,2].
Form a pair with nums[0] and nums[1] and remove them from nums. Now, nums = [2].
No more pairs can be formed. A total of 3 pairs have been formed, and there is 1 number leftover in nums.
</pre>

Example 2:

<pre>
Input: nums = [1,1]
Output: [1,0]
Explanation: Form a pair with nums[0] and nums[1] and remove them from nums. Now, nums = [].
No more pairs can be formed. A total of 1 pair has been formed, and there are 0 numbers leftover in nums.
</pre>

Example 3:

<pre>
Input: nums = [0]
Output: [0,1]
Explanation: No pairs can be formed, and there is 1 number leftover in nums.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= nums.length &lt;= 100</code></li>
	<li><code>0 &lt;= nums[i] &lt;= 100</code></li>
</ul>

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