/in/foo.c: In function 'main':
/in/foo.c:11:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%d%d",&n,&na);//x1以内
  ^~~~~
/in/foo.c:11:2: warning: incompatible implicit declaration of built-in function 'scanf'
/in/foo.c:11:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
/in/foo.c: In function 'Count':
/in/foo.c:34:2: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
  printf("%d",n);
  ^~~~~~
/in/foo.c:34:2: warning: incompatible implicit declaration of built-in function 'printf'
/in/foo.c:34:2: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c: In function 'QYu':
/in/foo.c:66:6: warning: incompatible implicit declaration of built-in function 'printf'
      printf("%d ",b);
      ^~~~~~
/in/foo.c:66:6: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c:70:4: warning: incompatible implicit declaration of built-in function 'printf'
    printf("0 ");
    ^~~~~~
/in/foo.c:70:4: note: include '<stdio.h>' or provide a declaration of 'printf'