foo.cc: In function 'int main()':
foo.cc:11:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   11 |         gets(s1);gets(s2);gets(s3);
      |         ~~~~^~~~
In file included from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/cstdio:42,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/ext/string_conversions.h:43,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:3960,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/string:53,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/locale_classes.h:40,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/ios_base.h:41,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/ios:42,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/ostream:38,
                 from iostream:39:
/nix/store/linb70pgp53f0kygxm5wk163dx22d681-glibc-2.37-45-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.cc:11:22: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   11 |         gets(s1);gets(s2);gets(s3);
      |                  ~~~~^~~~
/nix/store/linb70pgp53f0kygxm5wk163dx22d681-glibc-2.37-45-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.cc:11:31: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   11 |         gets(s1);gets(s2);gets(s3);
      |                           ~~~~^~~~
/nix/store/linb70pgp53f0kygxm5wk163dx22d681-glibc-2.37-45-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.cc:39:16: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   39 |         if(temp!=strlen(s1)-1)
      |            ~~~~^~~~~~~~~~~~~~
foo.cc:41:33: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   41 |                 for(int i=temp;i<strlen(s1);i++)
      |                                ~^~~~~~~~~~~
foo.cc:14:13: warning: unused variable 's' [-Wunused-variable]
   14 |         int s=0;
      |             ^
/nix/store/3r87a2wq1w4l66wnsm7rqvy608mx23h6-binutils-2.40/bin/ld: /tmp/cc1GYbNx.o: in function `main':
foo.cc:(.text.startup+0x91): warning: the `gets' function is dangerous and should not be used.

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