user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<main>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  cmp    $0x1,%edi
  jg     L68
  mov    $0x14,%esi
  lea    D7(%rip),%rdi
  xor    %eax,%eax
  mov    $0x14,%r12d
  call   <printf@plt>
  mov    $0x14,%esi
  mov    $0x14,%edi
  call   <matriz_aloca@plt>
  mov    $0x14,%esi
  mov    $0x14,%edi
  mov    %rax,0x18(%rsp)
  call   <matriz_aloca@plt>
  mov    $0x14,%esi
  mov    $0x14,%edi
  mov    %rax,0x20(%rsp)
  call   <matriz_aloca@plt>
  xor    %edi,%edi
  mov    %rax,0x28(%rsp)
  call   <time@plt>
  mov    %eax,%edi
  call   <srand@plt>
L59:
  movslq %r12d,%r15
  mov    0x28(%rsp),%rbp
  mov    0x18(%rsp),%r14
  movl   $0x0,0xc(%rsp)
  lea    0x0(,%r15,4),%rax
  mov    0x20(%rsp),%r13
  mov    %rax,0x10(%rsp)
  mov    %rbp,%rbx
  nopl   0x0(%rax,%rax,1)
L6:
  xor    %r15d,%r15d
  nopl   0x0(%rax,%rax,1)
L20:
  xor    %eax,%eax
  call   <rand@plt>
  cltd
  idiv   %r12d
  xor    %eax,%eax
  mov    %edx,(%r14,%r15,4)
  call   <rand@plt>
  cltd
  idiv   %r12d
  mov    %edx,0x0(%r13,%r15,4)
  movl   $0x0,0x0(%rbp,%r15,4)
  add    $0x1,%r15
  cmp    %r15d,%r12d
  jg     L20
  mov    0x10(%rsp),%rcx
  addl   $0x1,0xc(%rsp)
  mov    0xc(%rsp),%eax
  add    %rcx,%r14
  add    %rcx,%r13
  add    %rcx,%rbp
  cmp    %r12d,%eax
  jl     L6
  mov    %r12d,%edx
  mov    %r12d,%esi
  lea    D36(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x28(%rsp),%rdx
  mov    %r12d,%r9d
  mov    %r12d,%r8d
  mov    0x20(%rsp),%rsi
  mov    0x18(%rsp),%rdi
  mov    %r12d,%ecx
  xor    %r13d,%r13d
  lea    D15(%rip),%rbp
  call   <matriz_multiplica@plt>
L33:
  xor    %r14d,%r14d
  nopl   0x0(%rax,%rax,1)
L22:
  mov    (%rbx,%r14,4),%esi
  mov    %rbp,%rdi
  xor    %eax,%eax
  add    $0x1,%r14
  call   <printf@plt>
  cmp    %r14d,%r12d
  jg     L22
  mov    $0xa,%edi
  add    $0x1,%r13d
  call   <putchar@plt>
  add    0x10(%rsp),%rbx
  cmp    %r12d,%r13d
  jl     L33
L41:
  lea    D47(%rip),%rdi
  call   <puts@plt>
  mov    0x18(%rsp),%rdi
  call   <matriz_libera@plt>
  mov    0x20(%rsp),%rdi
  call   <matriz_libera@plt>
  mov    0x28(%rsp),%rdi
  call   <matriz_libera@plt>
  add    $0x38,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L68:
  mov    0x8(%rsi),%rdi
  call   <atoi@plt>
  lea    D7(%rip),%rdi
  mov    %eax,%r12d
  mov    %eax,%esi
  xor    %eax,%eax
  call   <printf@plt>
  mov    %r12d,%esi
  mov    %r12d,%edi
  call   <matriz_aloca@plt>
  mov    %r12d,%esi
  mov    %r12d,%edi
  mov    %rax,0x18(%rsp)
  call   <matriz_aloca@plt>
  mov    %r12d,%esi
  mov    %r12d,%edi
  mov    %rax,0x20(%rsp)
  call   <matriz_aloca@plt>
  xor    %edi,%edi
  mov    %rax,0x28(%rsp)
  call   <time@plt>
  mov    %eax,%edi
  call   <srand@plt>
  test   %r12d,%r12d
  jg     L59
  mov    %r12d,%edx
  mov    %r12d,%esi
  lea    D36(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x28(%rsp),%rdx
  mov    %r12d,%r9d
  mov    %r12d,%r8d
  mov    0x20(%rsp),%rsi
  mov    0x18(%rsp),%rdi
  mov    %r12d,%ecx
  call   <matriz_multiplica@plt>
  jmp    L41
```

tool_calls: name: unpack_data
arguments: data_label: D7
datatype: string
name: unpack_data
arguments: data_label: D36
datatype: string
name: unpack_data
arguments: data_label: D15
datatype: string
name: unpack_data
arguments: data_label: D47
datatype: string

tool: D7: alocando %d elementos ...


tool: D36: iniciando multiplicacao dos %d x %d elementos ...


tool: D15: %d 

tool: D47: liberando memoria ...

assistant: ```c
int main(int argc, char **argv) {
  int n = 20;
  int *A, *B, *C;
  int i, j;
  if (argc > 1)
    n = atoi(argv[1]);
  printf("alocando %d elementos ...\n", n);
  A = matriz_aloca(n, n);
  B = matriz_aloca(n, n);
  C = matriz_aloca(n, n);
  srand(time(NULL));
  for (i = 0; i < n; i++) {
    for (j = 0; j < n; j++) {
      A[i * n + j] = rand() % n;
      B[i * n + j] = rand() % n;
      C[i * n + j] = 0;
    }
  }
  printf("iniciando multiplicacao dos %d x %d elementos ...\n", n, n);
  matriz_multiplica(A, B, C, n, n, n);
  for (i = 0; i < n; i++) {
    for (j = 0; j < n; j++) {
      printf("%d ", C[i * n + j]);
    }
    printf("\n");
  }
  printf("liberando memoria ...\n");
  matriz_libera(A);
  matriz_libera(B);
  matriz_libera(C);
  return 0;
}
```