321. Create Maximum Number 
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Problem
You are given two integer arrays nums1 and nums2 of lengths m and n respectively. nums1 and nums2 represent the digits of two numbers. You are also given an integer k.
Create the maximum number of length k <= m + n from digits of the two numbers. The relative order of the digits from the same array must be preserved.
Return an array of the k digits representing the answer.
Example 1:
Input: nums1 = [3,4,6,5], nums2 = [9,1,2,5,8,3], k = 5 Output: [9,8,6,5,3]
Example 2:
Input: nums1 = [6,7], nums2 = [6,0,4], k = 5 Output: [6,7,6,0,4]
Example 3:
Input: nums1 = [3,9], nums2 = [8,9], k = 3 Output: [9,8,9]
Constraints:
m == nums1.lengthn == nums2.length1 <= m, n <= 5000 <= nums1[i], nums2[i] <= 91 <= k <= m + n