foo.c: In function 'main':
foo.c:6:20: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    6 |                    scanf_s("%d %d %d", &a, &b, &c);
      |                    ^~~~~~~
      |                    scanf
/nix/store/dpxy5cr7cm0nch0qvq2qygs9jwnmhiy5-binutils-2.38/bin/ld: /tmp/ccENmwND.o: in function `main':
foo.c:(.text.startup+0x1b): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

[Hydro](https://hydro.ac)提供评测服务