case 3 failed: runtime error: exit status 2
panic: runtime error: index out of range [6] with length 6

goroutine 1 [running]:
main.main()
	/tmp/build-3541908430/solution.go:34 +0x8d0

input:
5 4
1 2
1 3
1 4
2 5
3 4 6 3 0
exit status 1