foo.c: In function 'main':
foo.c:7:5: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    7 |     scanf_s("%d", &n);
      |     ^~~~~~~
      |     scanf
foo.c:8:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
    8 |     gets(A);
      |     ^~~~
In file included from foo.c:1:
/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.c:9:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
    9 |     gets(B);
      |     ^~~~
/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__;
      |              ^~~~
/nix/store/3r87a2wq1w4l66wnsm7rqvy608mx23h6-binutils-2.40/bin/ld: /tmp/ccMvC0iH.o: in function `main':
foo.c:(.text.startup+0x20): warning: the `gets' function is dangerous and should not be used.
/nix/store/3r87a2wq1w4l66wnsm7rqvy608mx23h6-binutils-2.40/bin/ld: foo.c:(.text.startup+0x16): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

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