case 2 failed: runtime error: exit status 2
panic: runtime error: index out of range [-1]

goroutine 1 [running]:
main.main()
	/tmp/build-1790719341/solution.go:160 +0x1614

input:
8
7 5 8 2 1 7 5
10 4 8 7 9 5 3
3 9 1 10 7 6 3
4 1 5 8 7 2 6
2 1 4 6 3 1 6
7 1 5 4 8 6 6
10 8 5 3 1 5 5
8 6 3 8 6 3 9
exit status 1