/in/foo.cc: In function 'int main()':
/in/foo.cc:20:27: error: expected primary-expression before '/' token
   if(a[(t/2)-1] != a[t/2])/2)
                           ^
/in/foo.cc:23:17: error: expected ';' before ')' token
    cout <<a[t/2])/2;
                 ^