Increasing decreasing sequence

#1

how to solve this without using array or list ??
what is the correct code ,some of my test cases goes wrong??

#2

According to the question, the following possibilities may arise after splitting a sequence into two sequences:

-First Sequence is strictly decreasing , 2nd sequence is strictly increasing–> return true
-First Sequence is strictly increasing, 2nd sequence strictly decreases-------> return false
-If one sequence is empty and the other sequence is strictly increasing/decreasing—>return true.

Consider test case:
For input:
6
3
2
1
1
2
3

Now this splits into 2 sequences-- 3 2 1(decreasing) and 1 2 3(increasing)
So Expected Output:
true

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