/in/foo.cc: In function 'int main()':
/in/foo.cc:44:17: warning: unused variable 'l' [-Wunused-variable]
             int l,r,s;
                 ^
/in/foo.cc:44:19: warning: unused variable 'r' [-Wunused-variable]
             int l,r,s;
                   ^
/in/foo.cc:44:21: warning: unused variable 's' [-Wunused-variable]
             int l,r,s;
                     ^