foo.cc: In function 'int operator-(MyClass&, MyClass&)':
foo.cc:23:49: warning: unused variable 'b' [-Wunused-variable]
   23 |                         if (obj2.p(obj2)) { int b[12] = { 31,29,31,30,31,30,31,31,30,31,30,31 }; }
      |                                                 ^
foo.cc:38:49: warning: unused variable 'b' [-Wunused-variable]
   38 |                         if (obj1.p(obj1)) { int b[13] = {0, 31,29,31,30,31,30,31,31,30,31,30,31 }; }
      |                                                 ^

[Hydro](https://hydro.ac)提供评测服务