88. Merge Sorted Array

You are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and nums2 respectively.

Merge nums1 and nums2 into a single array sorted in non-decreasing order.

The final sorted array should not be returned by the function, but instead be stored inside the array nums1. To accommodate this, nums1 has a length of m + n, where the first m elements denote the elements that should be merged, and the last n elements are set to 0 and should be ignored. nums2 has a length of n.


def merge(nums1: List[int], m: int, nums2: List[int], n: int):
    """
    Do not return anything, modify nums1 in-place instead.
    """
   
    p1, p2 = m-1, n-1
    cur = m + n - 1
   
    while p1 >= 0 and p2 >= 0:
        if nums1[p1] > nums2[p2]:
            nums1[cur] = nums1[p1]
            p1 -= 1
        else:
            nums1[cur] = nums2[p2]
            p2 -= 1
        cur -= 1
       
    while p2 >= 0:
        nums1[cur] = nums2[p2]
        p2 -= 1
        cur -= 1

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