llvm-ir, 684 bytes

Result

WA

Duration

514ms

Code [DL]

@S=global[3x i8]c"-c\00", align 1
@T=global[134x i8]c"s=open(0).read().split();a,b,c,d,e,f,g,h,i=[int(s[i+3])-int(s[i%3])for i in range(9)];print((a*(e*i-h*f)+b*(f*g-i*d)+c*(d*h-g*e))//6)\00", align 1
@args=global[4x i8*][i8* getelementptr inbounds ([3x i8],[3x i8]*@S, i32 0, i32 0), i8* getelementptr inbounds ([3x i8],[3x i8]*@S, i32 0, i32 0), i8* getelementptr inbounds ([134x i8],[134x i8]*@T, i32 0, i32 0), i8* null], align 16
@U=global[5x i8]c"echo\00", align 1

define i32@main(){
%1=call i32@execvp(i8* getelementptr inbounds ([5x i8],[5x i8]*@U, i32 0, i32 0), i8** getelementptr inbounds ([4x i8*],[4x i8*]*@args, i32 0, i32 0))
ret i32 0
}

declare i32@execvp(i8*, i8**)

stdin

35 08 80
06 24 54
06 76 76
88 90 45

stdout

stderr

c: applet not found

strace