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Lỗi biên dịch:

Main.c: In function ‘XoaPhanTu’:
Main.c:15:5: warning: value computed is not used [-Wunused-value]
     *n--;
     ^~~~
Main.c: In function ‘main’:
Main.c:48:4: error: ‘vt’ undeclared (first use in this function); did you mean ‘vt2’?
    vt=i-1;
    ^~
    vt2
Main.c:48:4: note: each undeclared identifier is reported only once for each function it appears in
Main.c:40:6: warning: unused variable ‘vt2’ [-Wunused-variable]
  int vt2;
      ^~~
Main.c:33:6: warning: unused variable ‘vt1’ [-Wunused-variable]
  int vt1;
      ^~~
Main.c:25:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ^~~~~~~~~~~~~~
Main.c:30:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ^~~~~~~~~~~~~~~~~~