/in/foo.cc: In function 'int main()':
/in/foo.cc:9:52: warning: variable 'score1_max' set but not used [-Wunused-but-set-variable]
  int sum,n,score1,score2,paper,scholar,scholar_max,score1_max,score2_max,paper_max;
                                                    ^~~~~~~~~~
/in/foo.cc:9:63: warning: variable 'score2_max' set but not used [-Wunused-but-set-variable]
  int sum,n,score1,score2,paper,scholar,scholar_max,score1_max,score2_max,paper_max;
                                                               ^~~~~~~~~~
/in/foo.cc:9:74: warning: variable 'paper_max' set but not used [-Wunused-but-set-variable]
  int sum,n,score1,score2,paper,scholar,scholar_max,score1_max,score2_max,paper_max;
                                                                          ^~~~~~~~~
/in/foo.cc:10:13: warning: variable 'c1_max' set but not used [-Wunused-but-set-variable]
  char c1,c2,c1_max,c2_max;
             ^~~~~~
/in/foo.cc:10:20: warning: variable 'c2_max' set but not used [-Wunused-but-set-variable]
  char c1,c2,c1_max,c2_max;
                    ^~~~~~