/in/foo.cc: In function 'int Judge(char*, char*, int)':
/in/foo.cc:6:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j=0;j<strlen(s2);j++)
              ~^~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:15:5: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(s1);gets(s2);gets(s3);
     ^~~~
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:15:12: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(s1);gets(s2);gets(s3);
            ^
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:15:14: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(s1);gets(s2);gets(s3);
              ^~~~
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:15:21: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(s1);gets(s2);gets(s3);
                     ^
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:15:23: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(s1);gets(s2);gets(s3);
                       ^~~~
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:15:30: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(s1);gets(s2);gets(s3);
                              ^
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:17:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(flag1<strlen(s1)-strlen(s2))
           ~~~~~^~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:28:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(flag1<strlen(s1))
        ~~~~~^~~~~~~~~~~
/tmp/cc6AS98G.o: In function `main':
foo.cc:(.text.startup+0x57): warning: the `gets' function is dangerous and should not be used.