/in/foo.c: In function 'main':
/in/foo.c:5:15: warning: initializer-string for array of chars is too long
  char a[19] = "一二三四五六七八九",
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.c:6:11: warning: initializer-string for array of chars is too long
   b[19] = "一二三四五六七八九",
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.c:7:11: warning: initializer-string for array of chars is too long
   c[19] = "一二三四五六七八九";
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.c:7:3: warning: unused variable 'c' [-Wunused-variable]
   c[19] = "一二三四五六七八九";
   ^
/in/foo.c:6:3: warning: unused variable 'b' [-Wunused-variable]
   b[19] = "一二三四五六七八九",
   ^
/in/foo.c:5:7: warning: unused variable 'a' [-Wunused-variable]
  char a[19] = "一二三四五六七八九",
       ^
/in/foo.c:4:12: warning: unused variable 'i' [-Wunused-variable]
  int n, m, i, j = 0, d, e, f;
            ^