c-gcc, 146 bytes

Result

AC

Duration

550ms

Code [DL]

z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}

stdin

21 17 27
49 70 15
81 53 99
83 99 05

stdout

14468

stderr

/tmp/code.c:1:1: warning: data definition has no type or storage class
 z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}
 ^
/tmp/code.c:1:1: warning: type defaults to 'int' in declaration of 'z' [-Wimplicit-int]
/tmp/code.c:1:6: warning: data definition has no type or storage class
 z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}
      ^
/tmp/code.c:1:6: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
/tmp/code.c:1:12: warning: data definition has no type or storage class
 z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}
            ^
/tmp/code.c:1:12: warning: type defaults to 'int' in declaration of 's' [-Wimplicit-int]
/tmp/code.c:1:14: warning: type defaults to 'int' in declaration of 'q' [-Wimplicit-int]
 z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}
              ^
/tmp/code.c:1:16: warning: return type defaults to 'int' [-Wimplicit-int]
 z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}
                ^~~~
/tmp/code.c: In function 'main':
/tmp/code.c:1:16: warning: type of 'p' defaults to 'int' [-Wimplicit-int]
/tmp/code.c:1:36: warning: value computed is not used [-Wunused-value]
 z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}
                                    ^~
/tmp/code.c:1:73: warning: operation on 'p' may be undefined [-Wsequence-point]
 z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}
                                                                        ~^~~~~~~~
/tmp/code.c:1:86: warning: operation on 'q' may be undefined [-Wsequence-point]
 z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}
                                                                                     ~^~~~~~~~~~
/tmp/code.c:1:113: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
 z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}
                                                                                                                 ^~~~~
/tmp/code.c:1:113: warning: incompatible implicit declaration of built-in function 'scanf'
/tmp/code.c:1:113: note: include '<stdio.h>' or provide a declaration of 'scanf'
/tmp/code.c:1:129: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
 z=12;a[12];s,q;main(p){for(;z--;z<9&&(a[z]-=a[9+z%3]),z<3&&(s+=a[z]*=a[p=3+-~z%3]*a[q=6+(z+2)%3]-a[q-3]*a[p+3]))scanf("%d",a+z);printf("%d",s/6);}
                                                                                                                                 ^~~~~~
/tmp/code.c:1:129: warning: incompatible implicit declaration of built-in function 'printf'
/tmp/code.c:1:129: note: include '<stdio.h>' or provide a declaration of 'printf'

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