/in/foo.cc: In function 'int main()':
/in/foo.cc:6:4: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    gets(s);
    ^~~~
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:6:10: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    gets(s);
          ^
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:13:8: warning: array subscript has type 'char' [-Wchar-subscripts]
  s[mini]=' ';
        ^
/in/foo.cc:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0;i<strlen(s);i++)
               ~^~~~~~~~~~
/in/foo.cc:13:8: warning: 'mini' may be used uninitialized in this function [-Wmaybe-uninitialized]
  s[mini]=' ';
  ~~~~~~^
/tmp/ccnB8XS4.o: In function `main':
foo.cc:(.text.startup+0x14): warning: the `gets' function is dangerous and should not be used.