Find Original Array From Doubled Array
An integer array original is transformed into a doubled array changed by appending twice the value of every element in original, and then randomly shuffling the resulting array.
An integer array original is transformed into a doubled array changed by appending twice the value of every element in original, and then randomly shuffling the resulting array.
Given an array changed, return original if changed is a doubled array. If changed is not a doubled array, return an empty array. The elements in original may be returned in any order.
Example 1
Input: changed = [1,3,4,2,6,8]
Output: [1,3,4]
Explanation: One possible original array could be [1,3,4]: - Twice the value of 1 is 1 * 2 = 2. - Twice the value of 3 is 3 * 2 = 6. - Twice the value of 4 is 4 * 2 = 8. Other original arrays could be [4,3,1] or [3,1,4].
Example 2
Input: changed = [6,3,0,1]
Output: []
Explanation: changed is not a doubled array.
Example 3
Input: changed = [1]
Output: []
Explanation: changed is not a doubled array.
Constraints
- 1 <= changed.length <= 10^5
- 0 <= changed[i] <= 10^5
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