/in/foo.cc: In function 'int main()':
/in/foo.cc:16:6: warning: unused variable 'lx' [-Wunused-variable]
  int lx,ly,i,j,k;
      ^~
/in/foo.cc:16:9: warning: unused variable 'ly' [-Wunused-variable]
  int lx,ly,i,j,k;
         ^~
/in/foo.cc:17:7: warning: unused variable 'p' [-Wunused-variable]
  char p;
       ^