user: Converte this assembly snippet into its equivalent C code:

```asm
<queens>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x9b0,%rsp
  mov    %edi,-0x9a4(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x1,-0x9a0(%rbp)
  jmp    L30
L147:
  mov    -0x9a0(%rbp),%eax
  cltq
  movl   $0x0,-0x7f0(%rbp,%rax,4)
  addl   $0x1,-0x9a0(%rbp)
L30:
  mov    -0x9a0(%rbp),%eax
  cmp    -0x9a4(%rbp),%eax
  jle    L147
  movl   $0x2,-0x99c(%rbp)
  jmp    L66
L78:
  mov    -0x99c(%rbp),%eax
  cltq
  movl   $0x0,-0x330(%rbp,%rax,4)
  addl   $0x1,-0x99c(%rbp)
L66:
  mov    -0x9a4(%rbp),%eax
  add    %eax,%eax
  cmp    %eax,-0x99c(%rbp)
  jle    L78
  mov    $0x1,%eax
  sub    -0x9a4(%rbp),%eax
  mov    %eax,-0x998(%rbp)
  jmp    L130
L7:
  mov    -0x998(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  lea    -0x650(%rbp),%rax
  add    $0x18c,%rax
  add    %rdx,%rax
  movl   $0x0,(%rax)
  addl   $0x1,-0x998(%rbp)
L130:
  mov    -0x998(%rbp),%eax
  cmp    -0x9a4(%rbp),%eax
  jl     L7
  movl   $0x0,-0x994(%rbp)
  movl   $0x0,-0x990(%rbp)
  lea    -0x980(%rbp),%rax
  mov    %rax,-0x988(%rbp)
L48:
  addl   $0x1,-0x990(%rbp)
  mov    -0x990(%rbp),%eax
  cmp    -0x9a4(%rbp),%eax
  jle    L39
  addl   $0x1,-0x994(%rbp)
  jmp    L115
L39:
  movl   $0x1,-0x98c(%rbp)
  jmp    L22
L97:
  mov    -0x98c(%rbp),%eax
  cltq
  mov    -0x7f0(%rbp,%rax,4),%eax
  test   %eax,%eax
  jne    L144
  mov    -0x98c(%rbp),%edx
  mov    -0x990(%rbp),%eax
  add    %edx,%eax
  cltq
  mov    -0x330(%rbp,%rax,4),%eax
  test   %eax,%eax
  jne    L144
  mov    -0x98c(%rbp),%eax
  sub    -0x990(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  lea    -0x650(%rbp),%rax
  add    $0x18c,%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  test   %eax,%eax
  jne    L144
  mov    -0x98c(%rbp),%eax
  cltq
  movl   $0x1,-0x7f0(%rbp,%rax,4)
  mov    -0x98c(%rbp),%edx
  mov    -0x990(%rbp),%eax
  add    %edx,%eax
  cltq
  movl   $0x1,-0x330(%rbp,%rax,4)
  mov    -0x98c(%rbp),%eax
  sub    -0x990(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  lea    -0x650(%rbp),%rax
  add    $0x18c,%rax
  add    %rdx,%rax
  movl   $0x1,(%rax)
  mov    -0x988(%rbp),%rax
  lea    0x4(%rax),%rdx
  mov    %rdx,-0x988(%rbp)
  mov    -0x98c(%rbp),%edx
  mov    %edx,(%rax)
  jmp    L48
L157:
  nop
  subq   $0x4,-0x988(%rbp)
  mov    -0x988(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x98c(%rbp)
  mov    -0x98c(%rbp),%eax
  cltq
  movl   $0x0,-0x7f0(%rbp,%rax,4)
  mov    -0x98c(%rbp),%edx
  mov    -0x990(%rbp),%eax
  add    %edx,%eax
  cltq
  movl   $0x0,-0x330(%rbp,%rax,4)
  mov    -0x98c(%rbp),%eax
  sub    -0x990(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  lea    -0x650(%rbp),%rax
  add    $0x18c,%rax
  add    %rdx,%rax
  movl   $0x0,(%rax)
L144:
  addl   $0x1,-0x98c(%rbp)
L22:
  mov    -0x98c(%rbp),%eax
  cmp    -0x9a4(%rbp),%eax
  jle    L97
L115:
  subl   $0x1,-0x990(%rbp)
  cmpl   $0x0,-0x990(%rbp)
  jg     L157
  mov    -0x994(%rbp),%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L143
  call   <__stack_chk_fail@plt>
L143:
  leave
  ret
```

assistant: ```c
int queens(int n) {
  int dtab[100];
  int freetab1[100 + 1];
  int freetab2[2 * 100 + 1];
  int freetab3a[2 * 100 - 1];
  {
    int i;
    for (i = 1; i <= n; i++) {
      freetab1[i] = 0;
    }
  }
  {
    int i;
    for (i = 2; i <= 2 * n; i++) {
      freetab2[i] = 0;
    }
  }
  {
    int i;
    for (i = -(n - 1); i < n; i++) {
      (&freetab3a[100 - 1])[i] = 0;
    }
  }
  {
    int counter = 0;
    int i = 0;
    int *Dptr = &dtab[0];
  entry:
    i++;
    if (i > n) {
      counter++;
    } else {
      int j;
      for (j = 1; j <= n; j++) {
        if (freetab1[j] == 0 && freetab2[j + i] == 0 && (&freetab3a[100 - 1])[j - i] == 0) {
          freetab1[j] = 1;
          freetab2[j + i] = 1;
          (&freetab3a[100 - 1])[j - i] = 1;
          *Dptr++ = j;
          goto entry;
        comeback:
          j = *--Dptr;
          freetab1[j] = 0;
          freetab2[j + i] = 0;
          (&freetab3a[100 - 1])[j - i] = 0;
        }
      }
    }
    i--;
    if (i > 0)
      goto comeback;
    return counter;
  }
}
```