/in/foo.cc: In function 'int main()':
/in/foo.cc:56:11: warning: comparison with string literal results in unspecified behavior [-Waddress]
     if(a=="min")
           ^~~~~
/in/foo.cc:62:11: warning: comparison with string literal results in unspecified behavior [-Waddress]
     if(a=="hour")
           ^~~~~~
/in/foo.cc:42:9: warning: unused variable 'ansa' [-Wunused-variable]
     int ansa,ansb;
         ^~~~
/in/foo.cc:42:14: warning: unused variable 'ansb' [-Wunused-variable]
     int ansa,ansb;
              ^~~~