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Java Solution for LeetCode algorithm problems, continually updating
954\. Array of Doubled Pairs
Medium
Given an integer array of even length `arr`, return `true` _if it is possible to reorder_ `arr` _such that_ `arr[2 * i + 1] = 2 * arr[2 * i]` _for every_ `0 <= i < len(arr) / 2`_, or_ `false` _otherwise_.
**Example 1:**
**Input:** arr = [3,1,3,6]
**Output:** false
**Example 2:**
**Input:** arr = [2,1,2,6]
**Output:** false
**Example 3:**
**Input:** arr = [4,-2,2,-4]
**Output:** true
**Explanation:** We can take two groups, [-2,-4] and [2,4] to form [-2,-4,2,4] or [2,4,-2,-4].
**Constraints:**
* 2 <= arr.length <= 3 * 104
* `arr.length` is even.
* -105 <= arr[i] <= 105