c-gcc, 167 bytes

Result

WA

Duration

533ms

Code [DL]

a[12];main(y,z){z=12;for(;z--;)scanf("%d",a+z);for(z=9;z--;)a[z]-=a[9+z%3];printf("%d",(a[7]*(a[3]*a[2]-*a*a[5])+a[8]*(*a++*a[3]-a[2]**a)+a[5]*(a*a[4]-a[3]*a[1]))/6);}

stdin

86 31 66
67 91 07
26 16 63
62 71 54

stdout

stderr

/tmp/code.c:1:1: warning: data definition has no type or storage class
 a[12];main(y,z){z=12;for(;z--;)scanf("%d",a+z);for(z=9;z--;)a[z]-=a[9+z%3];printf("%d",(a[7]*(a[3]*a[2]-*a*a[5])+a[8]*(*a++*a[3]-a[2]**a)+a[5]*(a*a[4]-a[3]*a[1]))/6);}
 ^
/tmp/code.c:1:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
/tmp/code.c:1:7: warning: return type defaults to 'int' [-Wimplicit-int]
 a[12];main(y,z){z=12;for(;z--;)scanf("%d",a+z);for(z=9;z--;)a[z]-=a[9+z%3];printf("%d",(a[7]*(a[3]*a[2]-*a*a[5])+a[8]*(*a++*a[3]-a[2]**a)+a[5]*(a*a[4]-a[3]*a[1]))/6);}
       ^~~~
/tmp/code.c: In function 'main':
/tmp/code.c:1:7: warning: type of 'y' defaults to 'int' [-Wimplicit-int]
/tmp/code.c:1:7: warning: type of 'z' defaults to 'int' [-Wimplicit-int]
/tmp/code.c:1:32: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
 a[12];main(y,z){z=12;for(;z--;)scanf("%d",a+z);for(z=9;z--;)a[z]-=a[9+z%3];printf("%d",(a[7]*(a[3]*a[2]-*a*a[5])+a[8]*(*a++*a[3]-a[2]**a)+a[5]*(a*a[4]-a[3]*a[1]))/6);}
                                ^~~~~
/tmp/code.c:1:32: warning: incompatible implicit declaration of built-in function 'scanf'
/tmp/code.c:1:32: note: include '<stdio.h>' or provide a declaration of 'scanf'
/tmp/code.c:1:76: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
 a[12];main(y,z){z=12;for(;z--;)scanf("%d",a+z);for(z=9;z--;)a[z]-=a[9+z%3];printf("%d",(a[7]*(a[3]*a[2]-*a*a[5])+a[8]*(*a++*a[3]-a[2]**a)+a[5]*(a*a[4]-a[3]*a[1]))/6);}
                                                                            ^~~~~~
/tmp/code.c:1:76: warning: incompatible implicit declaration of built-in function 'printf'
/tmp/code.c:1:76: note: include '<stdio.h>' or provide a declaration of 'printf'
/tmp/code.c:1:122: error: lvalue required as increment operand
 a[12];main(y,z){z=12;for(;z--;)scanf("%d",a+z);for(z=9;z--;)a[z]-=a[9+z%3];printf("%d",(a[7]*(a[3]*a[2]-*a*a[5])+a[8]*(*a++*a[3]-a[2]**a)+a[5]*(a*a[4]-a[3]*a[1]))/6);}
                                                                                                                          ^~
/tmp/code.c:1:146: error: invalid operands to binary * (have 'int *' and 'int')
 a[12];main(y,z){z=12;for(;z--;)scanf("%d",a+z);for(z=9;z--;)a[z]-=a[9+z%3];printf("%d",(a[7]*(a[3]*a[2]-*a*a[5])+a[8]*(*a++*a[3]-a[2]**a)+a[5]*(a*a[4]-a[3]*a[1]))/6);}
                                                                                                                                                 ~^~~~~
/bin/script: line 16: /tmp/code: not found
rm: can't remove '/tmp/code': No such file or directory

strace