user: 请将以下的汇编代码转换成C语言代码：

```asm
<C>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %edi,0x30(%rsp)
  cmp    %esi,%edi
  jl     L51
  je     L483
  mov    %esi,%r8d
  test   %esi,%esi
  je     L483
  movl   $0x0,0x18(%rsp)
L173:
  mov    0x30(%rsp),%esi
  mov    %esi,%eax
  sub    $0x1,%esi
  mov    %esi,0x30(%rsp)
  cmp    %eax,%r8d
  jg     L426
  cmp    $0x1,%r8d
  je     L461
  cmp    %eax,%r8d
  je     L461
  lea    -0x2(%r8),%eax
  mov    %esi,0x4c(%rsp)
  mov    %r8d,%r11d
  mov    %eax,0x50(%rsp)
  movl   $0x0,0x1c(%rsp)
L393:
  mov    0x4c(%rsp),%eax
  mov    0x50(%rsp),%edi
  mov    %eax,0x5c(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x4c(%rsp)
  cmp    %edi,%eax
  jl     L463
  test   %edi,%edi
  je     L373
  cmp    %edi,%eax
  je     L373
  lea    -0x3(%r11),%esi
  mov    %eax,0x10(%rsp)
  mov    %esi,0x54(%rsp)
  movl   $0x0,0x20(%rsp)
L310:
  subl   $0x1,0x10(%rsp)
  mov    0x54(%rsp),%ecx
  mov    0x10(%rsp),%eax
  cmp    %ecx,%eax
  jl     L550
  test   %ecx,%ecx
  je     L31
  cmp    %ecx,%eax
  je     L31
  lea    -0x4(%r11),%edx
  mov    %eax,0x14(%rsp)
  mov    %edx,0x58(%rsp)
  movl   $0x0,0x24(%rsp)
L332:
  subl   $0x1,0x14(%rsp)
  mov    0x58(%rsp),%eax
  mov    0x14(%rsp),%r8d
  cmp    %eax,%r8d
  jl     L613
  je     L523
  test   %eax,%eax
  je     L523
  lea    -0x5(%r11),%eax
  movl   $0x0,0x28(%rsp)
  mov    %eax,0x2c(%rsp)
L376:
  mov    0x2c(%rsp),%eax
  sub    $0x1,%r8d
  cmp    %eax,%r8d
  jl     L596
  test   %eax,%eax
  je     L85
  cmp    %eax,%r8d
  je     L85
  lea    -0x6(%r11),%r9d
  mov    %r8d,%r15d
  xor    %edx,%edx
L622:
  sub    $0x1,%r15d
  cmp    %r9d,%r15d
  jl     L522
  test   %r9d,%r9d
  je     L472
  cmp    %r9d,%r15d
  je     L472
  xor    %ebx,%ebx
  lea    -0x7(%r11),%r14d
  mov    %r15d,%r13d
  mov    %r15d,%ecx
  mov    %ebx,%r15d
  mov    %r14d,%ebx
L664:
  sub    $0x1,%r13d
  cmp    %ebx,%r13d
  jl     L266
  test   %ebx,%ebx
  je     L479
  cmp    %ebx,%r13d
  je     L479
  lea    -0x8(%r11),%r10d
  mov    %ebx,0x8(%rsp)
  mov    %r13d,%r14d
  xor    %ebp,%ebp
  mov    %r11d,0xc(%rsp)
  mov    %r10d,%ebx
  mov    %r15d,%r11d
  mov    %r13d,%r10d
L407:
  sub    $0x1,%r14d
  cmp    %ebx,%r14d
  jl     L437
  test   %ebx,%ebx
  je     L364
  cmp    %ebx,%r14d
  je     L364
  mov    0xc(%rsp),%eax
  mov    %r14d,0x34(%rsp)
  mov    %r14d,%edi
  xor    %r12d,%r12d
  mov    %ebp,0x38(%rsp)
  mov    %ecx,%r13d
  mov    %r10d,%r15d
  mov    %edx,%r14d
  lea    -0x9(%rax),%esi
  mov    %r8d,%ebp
L239:
  sub    $0x1,%edi
  mov    %r9d,0x48(%rsp)
  mov    %r11d,0x44(%rsp)
  mov    %esi,0x40(%rsp)
  mov    %edi,0x3c(%rsp)
  call   <C>
  mov    0x3c(%rsp),%edi
  mov    0x40(%rsp),%esi
  add    %eax,%r12d
  mov    0x44(%rsp),%r11d
  mov    0x48(%rsp),%r9d
  cmp    %ebx,%edi
  jl     L688
  jne    L239
  mov    %ebp,%r8d
  mov    %r14d,%edx
  mov    0x38(%rsp),%ebp
  mov    0x34(%rsp),%r14d
  mov    %r13d,%ecx
  mov    %r15d,%r10d
  add    $0x1,%r12d
L559:
  add    %r12d,%ebp
  cmp    0x8(%rsp),%r14d
  jl     L521
  jne    L407
  mov    %r11d,%r15d
  mov    0x8(%rsp),%ebx
  mov    0xc(%rsp),%r11d
  mov    %r10d,%r13d
  lea    0x1(%rbp),%eax
L54:
  add    %eax,%r15d
  cmp    %r9d,%r13d
  jl     L59
L406:
  jne    L664
  mov    %r15d,%ebx
  mov    %ecx,%r15d
  add    $0x1,%ebx
L80:
  add    %ebx,%edx
  cmp    0x2c(%rsp),%r15d
  jl     L449
L390:
  jne    L622
  mov    %edx,%r14d
  add    $0x1,%r14d
L347:
  add    %r14d,0x28(%rsp)
  cmp    0x58(%rsp),%r8d
  jl     L87
L110:
  jne    L376
  mov    0x28(%rsp),%eax
  add    $0x1,%eax
L256:
  add    %eax,0x24(%rsp)
  mov    0x54(%rsp),%esi
  cmp    %esi,0x14(%rsp)
  jl     L555
L130:
  jne    L332
  mov    0x24(%rsp),%eax
  add    $0x1,%eax
L625:
  add    %eax,0x20(%rsp)
  mov    0x50(%rsp),%edx
  cmp    %edx,0x10(%rsp)
  jl     L380
L383:
  jne    L310
  mov    0x20(%rsp),%eax
  add    $0x1,%eax
L369:
  add    %eax,0x1c(%rsp)
  cmp    0x5c(%rsp),%r11d
  jg     L533
L589:
  jne    L393
  mov    0x1c(%rsp),%eax
  mov    %r11d,%r8d
  add    $0x1,%eax
L510:
  add    %eax,0x18(%rsp)
  cmp    %r8d,0x30(%rsp)
  jl     L439
L66:
  jne    L173
  mov    0x18(%rsp),%eax
  add    $0x1,%eax
L604:
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L521:
  mov    %r11d,%r15d
  lea    -0x1(%rbp),%eax
  mov    %r10d,%r13d
  mov    0x8(%rsp),%ebx
  mov    0xc(%rsp),%r11d
  add    %eax,%r15d
  cmp    %r9d,%r13d
  jge    L406
L59:
  mov    %r15d,%ebx
  mov    %ecx,%r15d
  sub    $0x1,%ebx
  add    %ebx,%edx
  cmp    0x2c(%rsp),%r15d
  jge    L390
L449:
  mov    %edx,%r14d
  sub    $0x1,%r14d
  add    %r14d,0x28(%rsp)
  cmp    0x58(%rsp),%r8d
  jge    L110
L87:
  mov    0x28(%rsp),%eax
  mov    0x54(%rsp),%esi
  sub    $0x1,%eax
  add    %eax,0x24(%rsp)
  cmp    %esi,0x14(%rsp)
  jge    L130
L555:
  mov    0x24(%rsp),%eax
  mov    0x50(%rsp),%edx
  sub    $0x1,%eax
  add    %eax,0x20(%rsp)
  cmp    %edx,0x10(%rsp)
  jge    L383
L380:
  mov    0x20(%rsp),%eax
  sub    $0x1,%eax
  add    %eax,0x1c(%rsp)
  cmp    0x5c(%rsp),%r11d
  jle    L589
L533:
  mov    0x1c(%rsp),%eax
  mov    %r11d,%r8d
  sub    $0x1,%eax
  add    %eax,0x18(%rsp)
  cmp    %r8d,0x30(%rsp)
  jge    L66
L439:
  mov    0x18(%rsp),%eax
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  sub    $0x1,%eax
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L437:
  mov    $0xffffffff,%r12d
  jmp    L559
L479:
  mov    $0x1,%eax
  jmp    L54
L522:
  mov    $0xffffffff,%ebx
  jmp    L80
L472:
  mov    $0x1,%ebx
  jmp    L80
  nopl   0x0(%rax)
L688:
  mov    %ebp,%r8d
  mov    %r14d,%edx
  mov    0x38(%rsp),%ebp
  mov    0x34(%rsp),%r14d
  mov    %r13d,%ecx
  mov    %r15d,%r10d
  sub    $0x1,%r12d
  jmp    L559
L85:
  mov    $0x1,%r14d
  jmp    L347
L596:
  mov    $0xffffffff,%r14d
  jmp    L347
  nopl   0x0(%rax)
L364:
  mov    $0x1,%r12d
  jmp    L559
L266:
  mov    $0xffffffff,%eax
  jmp    L54
L523:
  mov    $0x1,%eax
  jmp    L256
L613:
  mov    $0xffffffff,%eax
  jmp    L256
L31:
  mov    $0x1,%eax
  jmp    L625
L550:
  mov    $0xffffffff,%eax
  jmp    L625
L373:
  mov    $0x1,%eax
  jmp    L369
L463:
  mov    $0xffffffff,%eax
  jmp    L369
L461:
  mov    $0x1,%eax
  jmp    L510
L426:
  mov    $0xffffffff,%eax
  jmp    L510
L51:
  add    $0x68,%rsp
  mov    $0xffffffff,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L483:
  mov    $0x1,%eax
  jmp    L604
```

assistant: ```c
int C(int n, int k) {
  if (k > n)
    return -1;
  if (n == k || k == 0)
    return 1;
  return C(n - 1, k - 1) + C(n - 1, k);
}
```