foo.c: In function 'main':
foo.c:31:9: warning: unused variable 'x' [-Wunused-variable]
  int n, x, bj[100003];
         ^
foo.c:32:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ^~~~~~~~~~~~~~~
foo.c:34:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &sz[i]);
   ^~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务