/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:20:6: error: invalid conversion from 'int*' to 'int' [-fpermissive]
   sa += lis[a[n%na]];
   ~~~^~~~~~~~~~~~~~~
/in/foo.cc:21:6: error: invalid conversion from 'int*' to 'int' [-fpermissive]
   sb += lis[b[n%nb]];
   ~~~^~~~~~~~~~~~~~~