/in/foo.cc: In function 'bool pd(cl)':
/in/foo.cc:33:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,k;
           ^
/in/foo.cc:33:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k;
             ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:40:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k;
             ^