foo.c: In function 'main':
foo.c:25:5: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
   25 |     scanf_s("%d %d", &x1, &n1);
      |     ^~~~~~~
      |     scanf
/nix/store/74y3751gsixaz9797ib0hp7c658sp1y5-binutils-2.40/bin/ld: /tmp/ccuBzA8p.o: in function `main':
foo.c:(.text.startup+0x1d): undefined reference to `scanf_s'
/nix/store/74y3751gsixaz9797ib0hp7c658sp1y5-binutils-2.40/bin/ld: foo.c:(.text.startup+0x33): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

[Hydro](https://hydro.ac)提供评测服务