case 2: runtime error: exit status 2
panic: runtime error: index out of range [0] with length 0

goroutine 1 [running]:
main.solve(0x40000641e0, 0x400006e080)
	/tmp/build-4217927134/solution.go:47 +0x508
main.main()
	/tmp/build-4217927134/solution.go:21 +0x1e0