/in/foo.cc: In function 'void bfs(int, int)':
/in/foo.cc:17:16: error: invalid conversion from 'int*' to 'int' [-fpermissive]
           tx=hx+nexx[i][0];
              ~~^~~~~~~~~~~
/in/foo.cc:18:16: error: invalid conversion from 'int*' to 'int' [-fpermissive]
           ty=hy+nexx[i][1];  
              ~~^~~~~~~~~~~