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   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0xa8,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,-0xc8(%rbp)
  lea    D3(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  lea    -0x78(%rbp),%rdx
  lea    -0x80(%rbp),%rax
  mov    %rax,%rsi
  lea    D7(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  mov    -0x78(%rbp),%rbx
  mov    -0x80(%rbp),%rcx
  mov    %rbx,%rax
  sub    $0x1,%rax
  mov    %rax,-0x50(%rbp)
  mov    %rbx,-0xc0(%rbp)
  movq   $0x0,-0xb8(%rbp)
  mov    %rcx,%rax
  sub    $0x1,%rax
  mov    %rax,-0x48(%rbp)
  mov    %rbx,-0xa0(%rbp)
  movq   $0x0,-0x98(%rbp)
  mov    %rcx,-0xb0(%rbp)
  movq   $0x0,-0xa8(%rbp)
  mov    -0xa0(%rbp),%r10
  mov    -0x98(%rbp),%r11
  mov    %r11,%rdx
  mov    -0xb0(%rbp),%r8
  mov    -0xa8(%rbp),%r9
  imul   %r8,%rdx
  mov    %r9,%rax
  imul   %r10,%rax
  lea    (%rdx,%rax,1),%rsi
  mov    %r10,%rax
  mul    %r8
  add    %rdx,%rsi
  mov    %rsi,%rdx
  mov    %rbx,%r14
  mov    $0x0,%r15d
  mov    %rcx,%r12
  mov    $0x0,%r13d
  mov    %r15,%rdx
  imul   %r12,%rdx
  mov    %r13,%rax
  imul   %r14,%rax
  lea    (%rdx,%rax,1),%rsi
  mov    %r14,%rax
  mul    %r12
  add    %rdx,%rsi
  mov    %rsi,%rdx
  mov    %rcx,%rax
  imul   %rbx,%rax
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L25:
  cmp    %rdx,%rsp
  je     L84
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L25
L84:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L69
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L69:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x40(%rbp)
  movq   $0x0,-0x60(%rbp)
  jmp    L12
L7:
  movq   $0x0,-0x58(%rbp)
  jmp    L28
L63:
  mov    %rbx,%rdx
  imul   -0x60(%rbp),%rdx
  mov    -0x58(%rbp),%rax
  add    %rax,%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rsi
  lea    D18(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  addq   $0x1,-0x58(%rbp)
L28:
  mov    -0x78(%rbp),%rax
  cmp    %rax,-0x58(%rbp)
  jb     L63
  addq   $0x1,-0x60(%rbp)
L12:
  mov    -0x80(%rbp),%rax
  cmp    %rax,-0x60(%rbp)
  jb     L7
  lea    D14(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  jmp    L49
L72:
  lea    D19(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    -0x78(%rbp),%rcx
  mov    -0x80(%rbp),%rax
  mov    -0x40(%rbp),%rdx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <print_screen@plt>
  lea    D28(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  movzbl -0x81(%rbp),%eax
  movsbl %al,%r8d
  mov    -0x68(%rbp),%rdi
  mov    -0x70(%rbp),%rcx
  mov    -0x78(%rbp),%rsi
  mov    -0x80(%rbp),%rax
  mov    -0x40(%rbp),%rdx
  mov    %r8d,%r9d
  mov    %rdi,%r8
  mov    %rax,%rdi
  call   <paint_fill@plt>
  mov    -0x78(%rbp),%rcx
  mov    -0x80(%rbp),%rax
  mov    -0x40(%rbp),%rdx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <print_screen@plt>
L49:
  lea    -0x81(%rbp),%rcx
  lea    -0x68(%rbp),%rdx
  lea    -0x70(%rbp),%rax
  mov    %rax,%rsi
  lea    D50(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  cmp    $0x3,%eax
  je     L72
  mov    $0x0,%eax
  mov    -0xc8(%rbp),%rsp
  mov    -0x38(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L85
  call   <__stack_chk_fail@plt>
L85:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

tool_calls: name: disassemble_data
arguments: data_label: D3
data_type: string
name: disassemble_data
arguments: data_label: D7
data_type: string
name: disassemble_data
arguments: data_label: D18
data_type: string
name: disassemble_data
arguments: data_label: D14
data_type: string
name: disassemble_data
arguments: data_label: D19
data_type: string
name: disassemble_data
arguments: data_label: D28
data_type: string
name: disassemble_data
arguments: data_label: D50
data_type: string

tool: D3: Enter screen size (X x Y), an each cell's color.


tool: D7: %zu%zu

tool: D18:  %c

tool: D14: Now enter your queries. The query format is: X Y C, where X and Y indicate the target cell, and C the new color.


tool: D19: Before:


tool: D28: After:


tool: D50: %zu%zu %c

assistant: ```c
int main(void) {
  printf("Enter screen size (X x Y), an each cell's color.\n");
  size_t x, y;
  scanf("%zu%zu", &x, &y);
  char screen[x][y];
  size_t i;
  for (i = 0; i < x; i++) {
    size_t j;
    for (j = 0; j < y; j++) {
      scanf(" %c", &screen[i][j]);
    }
  }
  printf("Now enter your queries. The query format is: X Y C, "
         "where X and Y indicate the target cell, and C the new color.\n");
  size_t px, py;
  char new_color;
  while (scanf("%zu%zu %c", &px, &py, &new_color) == 3) {
    printf("Before:\n");
    print_screen(x, y, screen);
    printf("After:\n");
    paint_fill(x, y, screen, px, py, new_color);
    print_screen(x, y, screen);
  }
  return 0;
}
```