message: Update merge-sorted-array.py
diff: @@ -36,6 +36,8 @@ if __name__ == "__main__":
  print A
  +# Time: O(n)
  +# Space: O(n)
  # you may get a input like this,
  # nums1 : [0]
  # m : 0
  @@ -59,4 +61,7 @@ class Solution2:
  nums1[m+n-1] = nums2[n-1]
  n -= 1
  if n > 0:
  - nums1[:n] = nums2[:n]
  + nums1[:n] = nums2[:n] # Space: O(n),
  + # Reference:
  + # - https://stackoverflow.com/questions/4948293/python-slice-assignment-memory-usage
  + # - https://stackoverflow.com/questions/10623302/how-assignment-works-with-python-list-slice
  