time go run main.go 16 20
[0 8 11 13 15]
[0 4 12 14]
[0 1 2 10]
[0 5 7 9]
[0 3 6]
[1 3 4 5 15]
[1 6 9 13]
[1 7 8 14]
[1 11 12]
[2 9 14 15]
[2 5 12 13]
[2 4 6 8]
[2 3 7 11]
[3 8 9 12]
[3 10 13 14]
[4 7 13]
[4 9 10 11]
[5 8 10]
[5 6 11 14]
[6 7 10 12 15]
go run main.go 16 20  19.15s user 1.40s system 100% cpu 20.522 total