/in/foo.cc: In function 'int main()':
/in/foo.cc:12:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(s+1);
         ^~~~
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:12:17: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(s+1);
                 ^
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:18:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
             gets(s+1);
             ^~~~
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:18:21: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
             gets(s+1);
                     ^
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:30:13: warning: 'flag' may be used uninitialized in this function [-Wmaybe-uninitialized]
         awa:if (flag) puts("1");
             ^~
/tmp/cc6G5g2k.o: In function `main':
foo.cc:(.text.startup+0x94): warning: the `gets' function is dangerous and should not be used.