Main.c: In function ‘main’:
Main.c:7:2: warning: implicit declaration of function ‘scanf_s’; did you mean ‘scanf’? [-Wimplicit-function-declaration]
    7 |  scanf_s("%lld %lld", &n, &m);
      |  ^~~~~~~
      |  scanf
/usr/bin/ld: /tmp/ccuP51uD.o: in function `main':
Main.c:(.text.startup+0x16): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status