/in/foo.cc: In function 'int main()':
/in/foo.cc:9:2: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(s);
  ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/c++/6/ext/string_conversions.h:43,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 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:9:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(s);
        ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/c++/6/ext/string_conversions.h:43,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 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:22:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(j=0;j<max_len;j++)
  ^~~
/in/foo.cc:24:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   j=i;
   ^
/in/foo.cc:26:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(;i<=j+len[max_len]+1;i++)
  ^~~
/in/foo.cc:28:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return 0;
   ^~~~~~
/tmp/ccxczD9A.o: In function `main':
foo.cc:(.text.startup+0x34): warning: the `gets' function is dangerous and should not be used.