Main.cc: In function 'int main()':
Main.cc:7:5: error: 'scanf' was not declared in this scope
    7 |     scanf("%d",&n);
      |     ^~~~~
Main.cc:10:5: error: 'printf' was not declared in this scope
   10 |     printf("%d",m-1);
      |     ^~~~~~
Main.cc:2:1: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?
    1 | #include <stdlib.h>
  +++ |+#include <cstdio>
    2 |