/in/foo.cc: In function 'int main()':
/in/foo.cc:5:15: warning: unused variable 'a' [-Wunused-variable]
     long long a,b,c;
               ^
/in/foo.cc:5:17: warning: unused variable 'b' [-Wunused-variable]
     long long a,b,c;
                 ^
/in/foo.cc:5:19: warning: unused variable 'c' [-Wunused-variable]
     long long a,b,c;
                   ^