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Java Solution for LeetCode algorithm problems, continually updating
2206\. Divide Array Into Equal Pairs
Easy
You are given an integer array `nums` consisting of `2 * n` integers.
You need to divide `nums` into `n` pairs such that:
* Each element belongs to **exactly one** pair.
* The elements present in a pair are **equal**.
Return `true` _if nums can be divided into_ `n` _pairs, otherwise return_ `false`.
**Example 1:**
**Input:** nums = [3,2,3,2,2,2]
**Output:** true
**Explanation:**
There are 6 elements in nums, so they should be divided into 6 / 2 = 3 pairs.
If nums is divided into the pairs (2, 2), (3, 3), and (2, 2), it will satisfy all the conditions.
**Example 2:**
**Input:** nums = [1,2,3,4]
**Output:** false
**Explanation:**
There is no way to divide nums into 4 / 2 = 2 pairs such that the pairs satisfy every condition.
**Constraints:**
* `nums.length == 2 * n`
* `1 <= n <= 500`
* `1 <= nums[i] <= 500`