/in/foo.cc: In function 'int main()':
/in/foo.cc:21:12: warning: unused variable 'cut' [-Wunused-variable]
  int a, b, cut = 0,flag=0;
            ^~~
/in/foo.cc:21:20: warning: variable 'flag' set but not used [-Wunused-but-set-variable]
  int a, b, cut = 0,flag=0;
                    ^~~~