/in/foo.cc: In function 'int main()':
/in/foo.cc:12:6: warning: unused variable 'n' [-Wunused-variable]
  int n, m,flag;
      ^
/in/foo.cc:12:9: warning: unused variable 'm' [-Wunused-variable]
  int n, m,flag;
         ^
/in/foo.cc:12:11: warning: unused variable 'flag' [-Wunused-variable]
  int n, m,flag;
           ^
/in/foo.cc:13:12: warning: unused variable 'c' [-Wunused-variable]
  long long c,w=0,l=0;
            ^
/in/foo.cc:14:14: warning: unused variable 'max' [-Wunused-variable]
  int i=0, j, max=0,k,num=0;
              ^
/in/foo.cc:14:20: warning: unused variable 'k' [-Wunused-variable]
  int i=0, j, max=0,k,num=0;
                    ^
/in/foo.cc:14:22: warning: unused variable 'num' [-Wunused-variable]
  int i=0, j, max=0,k,num=0;
                      ^