Watch 10 video solutions for Array of Doubled Pairs, a medium level problem involving Array, Hash Table, Greedy. This walkthrough by Fisher Coder has 3,122 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
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 * 104arr.length is even.-105 <= arr[i] <= 105