#2341
Maximum Number of Pairs in Array
newbie · 215 · lc easy +17 · verified · 76% accepted · 740 likes · top 87%
Description
You are given a 0-indexed integer array nums. Repeatedly pick any two equal integers in nums, remove both, and record one pair. Continue until no equal pair remains.
Return a 0-indexed integer array answer of size 2 where answer[0] is the total pairs formed and answer[1] is the count of leftover integers.
Example 1:
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.
Example 2:
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.
Example 3:
Input: nums = [0]
Output: [0,1]
Explanation: No pairs can be formed, and there is 1 number leftover in nums.
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