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
  add    $0xffffffffffffff80,%rsp
  mov    %edi,-0x74(%rbp)
  mov    %rsi,-0x80(%rbp)
  movl   $0x0,-0x70(%rbp)
  movl   $0x0,-0x64(%rbp)
  movq   $0x0,-0x38(%rbp)
  movq   $0x0,-0x28(%rbp)
  cmpl   $0x1,-0x74(%rbp)
  jg     L649
  mov    -0x80(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,%rsi
  lea    D52(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    D21(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0x0,%eax
  jmp    L540
L649:
  mov    -0x80(%rbp),%rax
  mov    0x8(%rax),%rax
  mov    %rax,-0x18(%rbp)
  cmpl   $0x2,-0x74(%rbp)
  jle    L476
  mov    -0x80(%rbp),%rax
  add    $0x10,%rax
  mov    (%rax),%rax
  mov    %rax,%rdi
  call   <atol@plt>
  cltq
  jmp    L395
L476:
  mov    $0x14,%eax
L395:
  mov    %rax,-0x30(%rbp)
  cmpq   $0x0,-0x30(%rbp)
  jg     L423
  movq   $0x1,-0x30(%rbp)
L423:
  cmpl   $0x3,-0x74(%rbp)
  jle    L272
  mov    -0x80(%rbp),%rax
  add    $0x18,%rax
  mov    (%rax),%rax
  mov    %rax,%rdi
  call   <atoi@plt>
  jmp    L650
L272:
  mov    $0x1,%eax
L650:
  mov    %eax,-0x54(%rbp)
  cmpl   $0x4,-0x74(%rbp)
  jle    L275
  mov    -0x80(%rbp),%rax
  add    $0x20,%rax
  mov    (%rax),%rax
  mov    %rax,%rdi
  call   <atoi@plt>
  cltq
  jmp    L405
L275:
  mov    $0x0,%eax
L405:
  mov    %rax,-0x20(%rbp)
  cmpq   $0x0,-0x20(%rbp)
  jns    L610
  movq   $0x0,-0x20(%rbp)
L610:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,-0x50(%rbp)
  movl   $0x0,-0x58(%rbp)
  jmp    L525
L271:
  mov    -0x58(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x2c,%al
  jne    L253
  addl   $0x1,-0x64(%rbp)
L253:
  mov    -0x58(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x29,%al
  jne    L104
  mov    -0x70(%rbp),%eax
  cmp    -0x64(%rbp),%eax
  jge    L447
  mov    -0x64(%rbp),%eax
  mov    %eax,-0x70(%rbp)
L447:
  movl   $0x0,-0x64(%rbp)
L104:
  mov    -0x58(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x5b,%al
  jne    L452
  mov    -0x50(%rbp),%eax
  mov    %eax,-0x58(%rbp)
L452:
  addl   $0x1,-0x58(%rbp)
L525:
  mov    -0x58(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jl     L271
  mov    -0x70(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x4c(%rbp)
  mov    -0x4c(%rbp),%eax
  cltq
  mov    %eax,%edx
  mov    -0x30(%rbp),%rax
  imul   %edx,%eax
  shl    $0x2,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x4c(%rbp),%eax
  cltq
  shl    $0x2,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L64
  cmpq   $0x0,-0x8(%rbp)
  jne    L435
L64:
  lea    D41(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0xffffffff,%edi
  call   <exit@plt>
L435:
  mov    -0x10(%rbp),%rax
  movl   $0x0,(%rax)
  mov    -0x10(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x60(%rbp)
  mov    -0x60(%rbp),%eax
  mov    %eax,-0x64(%rbp)
  movl   $0x0,-0x58(%rbp)
  jmp    L420
L641:
  mov    -0x58(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x2c,%al
  jne    L151
  addl   $0x1,-0x64(%rbp)
  mov    -0x60(%rbp),%eax
  imul   -0x4c(%rbp),%eax
  mov    %eax,%edx
  mov    -0x64(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movl   $0x0,(%rax)
L151:
  mov    -0x58(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x29,%al
  jne    L408
  addl   $0x1,-0x60(%rbp)
  movl   $0x0,-0x64(%rbp)
  mov    -0x60(%rbp),%eax
  imul   -0x4c(%rbp),%eax
  mov    %eax,%edx
  mov    -0x64(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movl   $0x0,(%rax)
L408:
  mov    -0x58(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x5b,%al
  jne    L257
  jmp    L188
L311:
  mov    -0x58(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  sub    $0x30,%eax
  cltq
  mov    %rax,-0x40(%rbp)
  cmpq   $0x0,-0x40(%rbp)
  js     L234
  cmpq   $0x9,-0x40(%rbp)
  jg     L234
  mov    -0x38(%rbp),%rdx
  mov    %rdx,%rax
  shl    $0x2,%rax
  add    %rdx,%rax
  add    %rax,%rax
  mov    %rax,%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x38(%rbp)
L234:
  addl   $0x1,-0x58(%rbp)
L188:
  mov    -0x58(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jl     L311
L257:
  mov    -0x58(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  sub    $0x30,%eax
  cltq
  mov    %rax,-0x40(%rbp)
  cmpq   $0x0,-0x40(%rbp)
  js     L517
  cmpq   $0x9,-0x40(%rbp)
  jg     L517
  mov    -0x60(%rbp),%eax
  imul   -0x4c(%rbp),%eax
  mov    %eax,%edx
  mov    -0x64(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    %edx,%eax
  shl    $0x2,%eax
  add    %edx,%eax
  add    %eax,%eax
  mov    %eax,%edx
  mov    -0x40(%rbp),%rax
  add    %eax,%edx
  mov    -0x60(%rbp),%eax
  imul   -0x4c(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x64(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x10(%rbp),%rax
  add    %rcx,%rax
  mov    %edx,(%rax)
L517:
  addl   $0x1,-0x58(%rbp)
L420:
  mov    -0x58(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jl     L641
  cmpq   $0x0,-0x38(%rbp)
  jg     L356
  movq   $0x2,-0x38(%rbp)
L356:
  cmpl   $0x0,-0x60(%rbp)
  jne    L643
  lea    D2(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0x0,%eax
  jmp    L540
L643:
  mov    -0x60(%rbp),%eax
  sub    $0x1,%eax
  cltq
  mov    %rax,-0x48(%rbp)
  jmp    L484
L142:
  movl   $0x0,-0x64(%rbp)
  jmp    L605
L115:
  mov    $0x28,%edi
  call   <putchar@plt>
  movl   $0x0,-0x60(%rbp)
  jmp    L597
L21:
  mov    -0x64(%rbp),%eax
  imul   -0x4c(%rbp),%eax
  mov    %eax,%edx
  mov    -0x60(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  mov    %eax,%esi
  lea    D20(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  addl   $0x1,-0x60(%rbp)
L597:
  mov    -0x60(%rbp),%eax
  cmp    -0x70(%rbp),%eax
  jl     L21
  mov    -0x64(%rbp),%eax
  imul   -0x4c(%rbp),%eax
  mov    %eax,%edx
  mov    -0x70(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  mov    %eax,%esi
  lea    D26(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  addl   $0x1,-0x64(%rbp)
L605:
  mov    -0x64(%rbp),%eax
  cltq
  cmp    %rax,-0x48(%rbp)
  jge    L115
  mov    -0x38(%rbp),%rax
  mov    %rax,%rsi
  lea    D45(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  cmpl   $0x2,-0x54(%rbp)
  jne    L592
  addq   $0x1,-0x38(%rbp)
L592:
  cmpl   $0x3,-0x54(%rbp)
  jne    L465
  mov    -0x38(%rbp),%rax
  imul   %rax,%rax
  mov    %rax,-0x38(%rbp)
L465:
  mov    -0x4c(%rbp),%eax
  cltq
  imul   -0x48(%rbp),%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  test   %eax,%eax
  jne    L178
  movl   $0x0,-0x6c(%rbp)
  cmpl   $0x4,-0x54(%rbp)
  jne    L455
  addq   $0x1,-0x38(%rbp)
  jmp    L455
L178:
  mov    -0x70(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x58(%rbp)
  movl   $0x0,-0x6c(%rbp)
  movl   $0x0,-0x60(%rbp)
  jmp    L425
L426:
  mov    -0x60(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x4c(%rbp),%eax
  cltq
  imul   -0x48(%rbp),%rax
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  test   %eax,%eax
  jne    L101
  mov    -0x60(%rbp),%eax
  mov    %eax,-0x58(%rbp)
  mov    -0x70(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x60(%rbp)
L101:
  addl   $0x1,-0x60(%rbp)
L425:
  mov    -0x60(%rbp),%eax
  cmp    -0x70(%rbp),%eax
  jle    L426
  movq   $0x0,-0x40(%rbp)
  jmp    L231
L376:
  movl   $0x1,-0x68(%rbp)
  movl   $0x0,-0x5c(%rbp)
  jmp    L654
L82:
  mov    -0x5c(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x48(%rbp),%rax
  sub    -0x40(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x4c(%rbp),%eax
  cltq
  imul   %rdx,%rax
  add    %rcx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x5c(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x4c(%rbp),%eax
  cltq
  imul   -0x48(%rbp),%rax
  add    %rcx,%rax
  lea    0x0(,%rax,4),%rcx
  mov    -0x10(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  jl     L400
  movl   $0x0,-0x68(%rbp)
L400:
  addl   $0x1,-0x5c(%rbp)
L654:
  mov    -0x5c(%rbp),%eax
  cmp    -0x58(%rbp),%eax
  jl     L82
  cmpl   $0x0,-0x68(%rbp)
  je     L439
  movl   $0x0,-0x5c(%rbp)
  jmp    L366
L370:
  mov    -0x58(%rbp),%eax
  sub    $0x1,%eax
  cmp    %eax,-0x5c(%rbp)
  jge    L18
  mov    -0x5c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x4c(%rbp),%eax
  cltq
  imul   -0x48(%rbp),%rax
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x5c(%rbp),%eax
  movslq %eax,%rsi
  mov    -0x48(%rbp),%rax
  sub    -0x40(%rbp),%rax
  mov    %rax,%rcx
  mov    -0x4c(%rbp),%eax
  cltq
  imul   %rcx,%rax
  add    %rsi,%rax
  lea    0x0(,%rax,4),%rcx
  mov    -0x10(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  jmp    L20
L18:
  mov    $0x0,%eax
L20:
  mov    -0x5c(%rbp),%edx
  movslq %edx,%rdx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x8(%rbp),%rdx
  add    %rcx,%rdx
  mov    %eax,(%rdx)
  addl   $0x1,-0x5c(%rbp)
L366:
  mov    -0x5c(%rbp),%eax
  cmp    -0x70(%rbp),%eax
  jle    L370
  mov    -0x40(%rbp),%rax
  mov    %eax,-0x6c(%rbp)
  mov    -0x48(%rbp),%rax
  add    $0x1,%rax
  mov    %rax,-0x40(%rbp)
L439:
  addq   $0x1,-0x40(%rbp)
L231:
  mov    -0x40(%rbp),%rax
  cmp    -0x48(%rbp),%rax
  jle    L376
L455:
  cmpl   $0x4,-0x54(%rbp)
  jne    L12
  mov    -0x6c(%rbp),%eax
  cltq
  mov    -0x38(%rbp),%rdx
  sub    $0x1,%rdx
  imul   %rax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  jmp    L543
L12:
  mov    -0x6c(%rbp),%eax
  cltq
  imul   -0x38(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
L543:
  mov    %rax,-0x40(%rbp)
  mov    -0x40(%rbp),%rax
  cmp    -0x30(%rbp),%rax
  jle    L150
  mov    -0x30(%rbp),%rax
  mov    %rax,%rsi
  lea    D95(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0x0,%eax
  jmp    L540
L150:
  cmpq   $0x0,-0x20(%rbp)
  je     L563
  mov    -0x28(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x28(%rbp)
  cmp    %rax,-0x20(%rbp)
  jg     L563
  mov    -0x20(%rbp),%rax
  mov    %rax,%rsi
  lea    D58(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0x0,%eax
  jmp    L540
L625:
  movl   $0x0,-0x5c(%rbp)
  jmp    L143
L135:
  mov    -0x5c(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x6c(%rbp),%eax
  movslq %eax,%rsi
  mov    -0x48(%rbp),%rax
  sub    %rsi,%rax
  mov    %rax,%rdx
  mov    -0x4c(%rbp),%eax
  cltq
  imul   %rdx,%rax
  add    %rcx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x5c(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x5c(%rbp),%eax
  movslq %eax,%rsi
  mov    -0x4c(%rbp),%eax
  cltq
  imul   -0x48(%rbp),%rax
  add    %rsi,%rax
  lea    0x0(,%rax,4),%rsi
  mov    -0x10(%rbp),%rax
  add    %rsi,%rax
  add    %ecx,%edx
  mov    %edx,(%rax)
  addl   $0x1,-0x5c(%rbp)
L143:
  mov    -0x5c(%rbp),%eax
  cmp    -0x70(%rbp),%eax
  jle    L135
  addq   $0x1,-0x48(%rbp)
L563:
  mov    -0x48(%rbp),%rax
  cmp    -0x40(%rbp),%rax
  jl     L625
  subq   $0x1,-0x48(%rbp)
L484:
  cmpq   $0x0,-0x48(%rbp)
  jns    L142
  mov    -0x38(%rbp),%rax
  mov    %rax,%rsi
  lea    D82(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0x0,%eax
L540:
  leave
  ret
```

tool_calls: name: disassemble_data
arguments: label: D52
type_infered: string
name: disassemble_data
arguments: label: D21
type_infered: string
name: disassemble_data
arguments: label: D41
type_infered: string
name: disassemble_data
arguments: label: D2
type_infered: string
name: disassemble_data
arguments: label: D20
type_infered: string
name: disassemble_data
arguments: label: D26
type_infered: string
name: disassemble_data
arguments: label: D45
type_infered: string
name: disassemble_data
arguments: label: D95
type_infered: string
name: disassemble_data
arguments: label: D58
type_infered: string
name: disassemble_data
arguments: label: D82
type_infered: string

tool: D52: Usage: %s ini [max] [opt] [step]


tool: D21: See comment in the source: http://gyafun.jp/ln/basmat.cgi?ini=s

tool: D41: Allocation failed.

tool: D2: Invalid initial parameter.

tool: D20: %d,

tool: D26: %d)

tool: D45: [%ld]


tool: D95: Length of sequence exceeds %ld at next step.


tool: D58: Maximum step of calculation %ld has reached.


tool: D82: Finished. n = %ld


assistant: ```c
int main(int argc, char *argv[]) {
  int *a, *b, c = 0, g, h, i = 0, j, l, m, y, len, opt;
  long f, k, n = 0, z, step = 0, maxstep;
  char *bm;
  if (argc < 2) {
    printf("Usage: %s ini [max] [opt] [step]\n", argv[0]);
    printf("See comment in the source: http://gyafun.jp/ln/basmat.cgi?ini=s\n");
    return 0;
  }
  bm = argv[1];
  z = (argc > 2) ? atol(argv[2]) : 20;
  if (z < 1)
    z = 1;
  opt = (argc > 3) ? atoi(argv[3]) : 1;
  maxstep = (argc > 4) ? atoi(argv[4]) : 0;
  if (maxstep < 0)
    maxstep = 0;
  len = strlen(bm);
  for (m = 0; m < len; m++) {
    if (bm[m] == ',')
      i++;
    if (bm[m] == ')') {
      if (c < i)
        c = i;
      i = 0;
    }
    if (bm[m] == '[')
      m = len;
  }
  y = c + 1;
  a = malloc(sizeof(int) * y * z);
  b = malloc(sizeof(int) * y);
  if (a == NULL || b == NULL) {
    printf("Allocation failed.\n");
    exit(-1);
  }
  i = j = a[0] = 0;
  for (m = 0; m < len; m++) {
    if (bm[m] == ',')
      i++, a[i + j * y] = 0;
    if (bm[m] == ')')
      j++, i = 0, a[i + j * y] = 0;
    if (bm[m] == '[') {
      for (; m < len; m++) {
        k = bm[m] - '0';
        if (k >= 0 && k <= 9)
          n = n * 10 + k;
      }
    }
    k = bm[m] - '0';
    if (k >= 0 && k <= 9)
      a[i + j * y] = a[i + j * y] * 10 + k;
  }
  if (n < 1)
    n = 2;
  if (j == 0) {
    printf("Invalid initial parameter.\n");
    return 0;
  }
  for (f = j - 1; f >= 0; f--) {
    for (i = 0; i <= f; i++) {
      printf("(");
      for (j = 0; j < c; j++)
        printf("%d,", a[j + i * y]);
      printf("%d)", a[c + i * y]);
    }
    printf("[%ld]\n", n);
    if (opt == 2)
      n++;
    if (opt == 3)
      n *= n;
    if (a[f * y] == 0) {
      g = 0;
      if (opt == 4)
        n++;
    } else {
      m = c + 1;
      g = 0;
      for (j = 0; j <= c; j++) {
        if (a[j + f * y] == 0)
          m = j, j = c + 1;
      }
      for (k = 0; k <= f; k++) {
        h = 1;
        for (l = 0; l < m; l++)
          if (a[l + (f - k) * y] >= a[l + f * y])
            h = 0;
        if (h) {
          for (l = 0; l <= c; l++)
            b[l] = (l < m - 1) ? a[l + f * y] - a[l + (f - k) * y] : 0;
          g = k;
          k = f + 1;
        }
      }
    }
    k = (opt == 4) ? f + g * (n - 1) : f + g * n;
    if (k > z) {
      printf("Length of sequence exceeds %ld at next step.\n", z);
      free(a);
      free(b);
      return 0;
    }
    if (maxstep && step++ >= maxstep) {
      printf("Maximum step of calculation %ld has reached.\n", maxstep);
      free(a);
      free(b);
      return 0;
    }
    while (f < k) {
      for (l = 0; l <= c; l++)
        a[l + f * y] = a[l + (f - g) * y] + b[l];
      f++;
    }
  }
  printf("Finished. n = %ld\n", n);
  free(a);
  free(b);
  return 0;
}
```