by@momohatt
WA
585ms
:let l=[] for i in range(4) for c in split(getline(i+1),'\_s') call add(l,str2nr(c)) endfor endfor for i in range(9) let l[i+3]-=l[(i%3)] endfor call setline(1, (l[3]*l[7]*l[11]+l[6]*l[10]*l[5]+l[9]*l[4]*l[8]-l[5]*l[7]*l[9]-l[8]*l[10]*l[3]-l[11]*l[4]*l[6])/6) :wq
:let l=[]<NL>for i in range(4)<NL> for c in split(getline(i+1),'\_s')<NL> call add(l,str2nr(c))<NL> endfor<NL>endfor<NL>for i in range(9)<NL>let l[i+3]-=l[(i%3)]<NL>endfor<NL>call setline(1, (l[3]*l[7]*l[11]+l[6]*l[10]*l[5]+l[9]*l[4]*l[8]-l[5]*l[7]*l[9]-l[8]*l[10]*l[3]-l[11]*l[4]*l[6])/6)<NL>:wq
79 01 27 68 73 01 37 58 16 82 88 58