Sample Test case states that it is not possible to construct 1 good permutation with N=4.

But, I think it can be possible like this:- 3 2 4 1. Here, only 1 good permutation is possible with L=1, R=4. Why sample test case states that it is not possible?

Considering your chosen array i.e. `[3, 2, 4, 1]`

.

One of the good sub-segment is where `L = 1`

, and `R = 4`

, i.e. `[3, 2, 4, 1]`

.

There can be one more good sub-segment where `L = 4`

and `R = 4`

, i.e. `[1]`

.

Therefore, there are more than `1`

good sub-segments possible for this particular case, hence answer is `-1`

.