I don't get the problem. Could someone explain to me?

According to @Shangrila 's explanation here.
"median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two middle value."
for example, the median of
[2, 3, 4]
is3
; and the median of[2, 3]
is(2 + 3) / 2 = 2.5
;"For this problem, what you should do is find the median after merging this two ordered array."