/in/foo.cc: In function 'int main()':
/in/foo.cc:8:8: warning: unused variable 'k' [-Wunused-variable]
  int i,k,l,n,m;
        ^
/in/foo.cc:8:10: warning: unused variable 'l' [-Wunused-variable]
  int i,k,l,n,m;
          ^
/in/foo.cc:8:14: warning: unused variable 'm' [-Wunused-variable]
  int i,k,l,n,m;
              ^