foo.cc: In member function 'int Time::operator-(const Time&)':
foo.cc:50:7: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   50 |   if(h=obj.h)
      |      ~^~~~~~
foo.cc: In function 'void test_1_2()':
foo.cc:76:8: warning: 'dt' may be used uninitialized in this function [-Wmaybe-uninitialized]
   76 |  cout<<x;
      |        ^

[Hydro](https://hydro.ac)提供评测服务