user: 请从给定的汇编指令推导出C源代码：

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    $0x0,%eax
  call   <__VERIFIER_nondet_ulong@plt>
  mov    %rax,-0x30(%rbp)
  mov    $0x0,%eax
  call   <__VERIFIER_nondet_ulong@plt>
  mov    %rax,-0x28(%rbp)
  mov    -0x30(%rbp),%rax
  shl    $0x2,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x20(%rbp)
  mov    -0x28(%rbp),%rax
  shl    $0x2,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x18(%rbp)
  mov    -0x28(%rbp),%rcx
  mov    -0x18(%rbp),%rdx
  mov    -0x30(%rbp),%rsi
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <is_relaxed_prefix@plt>
  test   %rax,%rax
  je     L4
  mov    -0x28(%rbp),%rax
  add    $0x1,%rax
  cmp    %rax,-0x30(%rbp)
  setbe  %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <__VERIFIER_assert@plt>
  mov    $0x0,%eax
  call   <__VERIFIER_nondet_ulong@plt>
  mov    %rax,-0x40(%rbp)
  mov    -0x30(%rbp),%rax
  cmp    -0x28(%rbp),%rax
  jbe    L116
  mov    -0x30(%rbp),%rax
  sub    $0x1,%rax
  mov    %rax,-0x40(%rbp)
L116:
  movl   $0x0,-0x48(%rbp)
  jmp    L146
L78:
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  lea    (%rdx,%rax,1),%rbx
  mov    $0x0,%eax
  call   <__VERIFIER_nondet_int@plt>
  mov    %eax,(%rbx)
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  lea    (%rdx,%rax,1),%rbx
  mov    $0x0,%eax
  call   <__VERIFIER_nondet_int@plt>
  mov    %eax,(%rbx)
  mov    -0x48(%rbp),%eax
  cltq
  cmp    %rax,-0x40(%rbp)
  jbe    L76
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <__VERIFIER_assume@plt>
  jmp    L50
L76:
  mov    -0x48(%rbp),%eax
  cltq
  cmp    %rax,-0x40(%rbp)
  jne    L25
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  setne  %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <__VERIFIER_assume@plt>
  jmp    L50
L25:
  mov    -0x48(%rbp),%eax
  cltq
  cmp    %rax,-0x40(%rbp)
  jae    L50
  mov    -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x48(%rbp),%eax
  cltq
  shl    $0x2,%rax
  lea    -0x4(%rax),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <__VERIFIER_assert@plt>
L50:
  addl   $0x1,-0x48(%rbp)
L146:
  mov    -0x48(%rbp),%eax
  cltq
  cmp    %rax,-0x30(%rbp)
  jbe    L23
  mov    -0x48(%rbp),%eax
  cltq
  cmp    %rax,-0x28(%rbp)
  ja     L78
  jmp    L23
L4:
  mov    -0x28(%rbp),%rax
  add    $0x1,%rax
  cmp    %rax,-0x30(%rbp)
  ja     L23
  movq   $0x0,-0x38(%rbp)
  movl   $0x0,-0x44(%rbp)
  jmp    L161
L2:
  mov    -0x44(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x44(%rbp),%eax
  cltq
  sub    -0x38(%rbp),%rax
  lea    0x0(,%rax,4),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  je     L31
  addq   $0x1,-0x38(%rbp)
L31:
  addl   $0x1,-0x44(%rbp)
L161:
  mov    -0x44(%rbp),%eax
  cltq
  cmp    %rax,-0x30(%rbp)
  jbe    L150
  mov    -0x44(%rbp),%eax
  cltq
  cmp    %rax,-0x28(%rbp)
  ja     L2
L150:
  mov    -0x30(%rbp),%rax
  cmp    -0x28(%rbp),%rax
  jbe    L54
  addq   $0x1,-0x38(%rbp)
L54:
  cmpq   $0x1,-0x38(%rbp)
  seta   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <__VERIFIER_assert@plt>
L23:
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0x0,%eax
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
int main() {
  unsigned long pat_len = __VERIFIER_nondet_ulong(), a_len = __VERIFIER_nondet_ulong();
  int *pat = malloc(sizeof(int) * pat_len);
  int *a = malloc(sizeof(int) * a_len);
  if (is_relaxed_prefix(pat, pat_len, a, a_len)) {
    __VERIFIER_assert(pat_len <= a_len + 1);
    unsigned long different = __VERIFIER_nondet_ulong();
    if (pat_len > a_len)
      different = pat_len - 1;
    for (int i = 0; i < pat_len && i < a_len; i++) {
      pat[i] = __VERIFIER_nondet_int();
      a[i] = __VERIFIER_nondet_int();
      if (i < different)
        __VERIFIER_assume(pat[i] == a[i]);
      else if (i == different)
        __VERIFIER_assume(pat[i] != a[i]);
      else if (i > different)
        __VERIFIER_assert(pat[i] == a[i - 1]);
    }
  } else if (pat_len <= a_len + 1) {
    unsigned long differences = 0;
    for (int i = 0; i < pat_len && i < a_len; i++) {
      if (pat[i] != a[i - differences])
        ++differences;
    }
    if (pat_len > a_len)
      ++differences;
    __VERIFIER_assert(differences > 1);
  }
  free(pat);
  free(a);
  return 0;
}
```