by@kcz146
WA
496ms
a=(`cat`) for((;z<9;)){ $[a[t=z]-=a[9+t%3],s+=t/6*a[z++]*(a[p=++t%3+3]*a[++t%3]-a[t+3]*a[p-3])/6] } echo $s
02 09 24 55 30 11 71 69 48 28 20 75
/volume/CODE: line 3: 09: value too great for base (error token is "09")