/in/foo.cc: In function 'void in()':
/in/foo.cc:17:1: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
 gets(a1);gets(b1);
 ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:17:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
 gets(a1);gets(b1);
        ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:17:10: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
 gets(a1);gets(b1);
          ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:17:17: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
 gets(a1);gets(b1);
                 ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/ccI08v8z.o: In function `in()':
foo.cc:(.text+0xc): warning: the `gets' function is dangerous and should not be used.

FormatError('config file not found',)