panic: runtime error: index out of range [1] with length 0

goroutine 1 [running]:
main.solve326E({0x400000e090, 0xc})
	/tmp/cf-worker-1738251531/verifierE.go:51 +0xa6c
main.runCase({0xffffdc60fbff, 0x2a}, {0xf619a?, 0x159a4?}, 0x253, 0x6)
	/tmp/cf-worker-1738251531/verifierE.go:144 +0xb4
main.main()
	/tmp/cf-worker-1738251531/verifierE.go:192 +0x1b8