It will be very helpful if anyone suggests the test case for which my code fails in subtask 1

1

Here is my code

https://www.codechef.com/viewsolution/33000386

Thanks in advance :v:

2

1
20 20
18 12 19 7 14 3 6 15 16 5 8 13 20 10 17 9 2 11 4 1

For the given input, your code output is -1 which is wrong. The answer for the above input can be computed in 10 steps.