by@yamayu832
AC
484ms
a=(`cat -`) for z in {0..8};{ t=$[a[z]-=a[9+z%3]] s=$[s+=z/6*a[z]*(a[p=3+(z+1)%3]*a[q=(z+2)%3]-a[q+3]*a[p-3])] } echo $[s/6]
04 87 92 18 28 28 02 77 36 65 68 04
27980