by@yamayu832
AC
484ms
a=(`cat`) for z in {0..8};{ $[a[z]-=a[9+z%3]] $[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]
27 86 46 40 67 57 19 20 68 37 38 05
10407
/volume/CODE: line 3: -10: command not found /volume/CODE: line 4: 0: command not found /volume/CODE: line 3: 48: command not found /volume/CODE: line 4: 0: command not found /volume/CODE: line 3: 41: command not found /volume/CODE: line 4: 0: command not found /volume/CODE: line 3: 3: command not found /volume/CODE: line 4: 0: command not found /volume/CODE: line 3: 29: command not found /volume/CODE: line 4: 0: command not found /volume/CODE: line 3: 52: command not found /volume/CODE: line 4: 0: command not found /volume/CODE: line 3: -18: command not found /volume/CODE: line 4: 23526: command not found /volume/CODE: line 3: -18: command not found /volume/CODE: line 4: 35100: command not found /volume/CODE: line 3: 63: command not found /volume/CODE: line 4: 62442: command not found