Given two 0-indexed integer arrays nums1 and nums2, return a list answer of size 2 where:

• answer is a list of all distinct integers in nums1 which are not present in nums2.
• answer is a list of all distinct integers in nums2 which are not present in nums1.

Note that the integers in the lists may be returned in any order.

Example 1:

Input: nums1 = [1,2,3], nums2 = [2,4,6]
Output: [[1,3],[4,6]]
Explanation:
For nums1, nums1 = 2 is present at index 0 of nums2, whereas nums1 = 1 and nums1 = 3 are not present in nums2. Therefore, answer = [1,3].
For nums2, nums2 = 2 is present at index 1 of nums1, whereas nums2 = 4 and nums2 = 6 are not present in nums2. Therefore, answer = [4,6].

Example 2:

Input: nums1 = [1,2,3,3], nums2 = [1,1,2,2]
Output: [,[]]
Explanation:
For nums1, nums1 and nums1 are not present in nums2. Since nums1 == nums1, their value is only included once and answer = .
Every integer in nums2 is present in nums1. Therefore, answer = [].


Constraints:

• 1 <= nums1.length, nums2.length <= 1000
• -1000 <= nums1[i], nums2[i] <= 1000

## Solution: Hashtable

Use two hashtables to store the unique numbers of array1 and array2 respectfully.

Time complexity: O(m+n)
Space complexity: O(m+n)

## C++

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