foo.c: In function 'main':
foo.c:8:9: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    8 |         scanf_s("%d%d", &a, & b);
      |         ^~~~~~~
      |         scanf
/nix/store/jfkmqz20q8fsaqizcml86adxqyzlwllx-binutils-2.38/bin/ld: /tmp/cc9bcLaR.o: in function `main':
foo.c:(.text.startup+0x26): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

[Hydro](https://hydro.ac)提供评测服务