/in/foo.cc: In function 'int main()':
/in/foo.cc:99:9: warning: unused variable 'answer' [-Wunused-variable]
     int answer = 0;
         ^~~~~~
/in/foo.cc:100:10: warning: unused variable 'is_bad' [-Wunused-variable]
     bool is_bad = false;
          ^~~~~~