Getting one WA in one testcase in Interesting Array problem

help
1

I am not sure on which testCase I am getting WA. This is my code.
I have tried on these testCases. Am I missing any?
6
1 1 1 1 2 2
5
1 2 3 4 5
5
5 4 3 2 1
5
1 1 2 2 200000000000

3

1
4
1 2 2 3

Your code gives -1 whereas 2 1 3 2 is a possible option?

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4

Thanks