panic: invalid argument to Intn goroutine 1 [running]: math/rand.(*Rand).Intn(0x12a078?, 0x40000b0140?) /usr/local/go/src/math/rand/rand.go:180 +0x64 main.genCases() /home/ubuntu/codeforces/0-999/700-799/730-739/730/verifierK.go:54 +0x250 main.main() /home/ubuntu/codeforces/0-999/700-799/730-739/730/verifierK.go:109 +0x108 exit status 2