case 71 failed: reference failed: runtime error: exit status 2
panic: runtime error: index out of range [-1]

goroutine 1 [running]:
main.solve.func2(...)
	/home/ubuntu/codeforces/1000-1999/1800-1899/1860-1869/1868/1868D.go:47
main.solve()
	/home/ubuntu/codeforces/1000-1999/1800-1899/1860-1869/1868/1868D.go:134 +0xd24
main.main()
	/home/ubuntu/codeforces/1000-1999/1800-1899/1860-1869/1868/1868D.go:153 +0xb0

input:
1
6
3 0 3 2 3 1
exit status 1