954. Array of Doubled Pairs

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 [