foo.cc: In function 'int main()':
foo.cc:6:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    6 |         gets(s1);
      |         ~~~~^~~~
In file included from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/cstdio:42,
                 from stdc++.h:46:
/nix/store/y8wfrgk7br5rfz4221lfb9v8w3n0cnyd-glibc-2.37-8-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.cc:7:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    7 |         gets(s2);
      |         ~~~~^~~~
/nix/store/y8wfrgk7br5rfz4221lfb9v8w3n0cnyd-glibc-2.37-8-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.cc:8:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
    8 |         for (int i=0;i<strlen(s1)-1;i++)
      |                      ~^~~~~~~~~~~~~
foo.cc:10:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   10 |         for (int i=1;i<strlen(s2);i++)
      |                      ~^~~~~~~~~~~
/nix/store/74y3751gsixaz9797ib0hp7c658sp1y5-binutils-2.40/bin/ld: /tmp/cciu7Yyi.o: in function `main':
foo.cc:(.text.startup+0x10): warning: the `gets' function is dangerous and should not be used.

[Hydro](https://hydro.ac)提供评测服务