I could not understand the question properly. The sample sequence has only increasing numbers so how can it be divided into two different sequences?
Kindly explain the problem statement more precisely.
Increasing decreasing sequence
hello @shreyasdaga in this question the word strictly is tricky that means A function 
is said to be strictly increasing on an interval 
if 
for all 
, where 
. On the other hand, if 
for all , the function is said to be (nonstrictly) increasing.
in this it can be either strictly increasing or decreasing also .
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