user: 下面的汇编指令对应的C源代码是什么：

```asm
<main>:
  endbr64
  push   %rbp
  lea    D16(%rip),%rdi
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x48,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  call   <printf@plt>
  lea    -0x50(%rbp),%rdx
  lea    -0x58(%rbp),%rsi
  xor    %eax,%eax
  lea    D7(%rip),%rdi
  call   <scanf@plt>
  mov    -0x50(%rbp),%rax
  mov    -0x58(%rbp),%rcx
  mov    %rsp,%rsi
  mov    %rax,-0x68(%rbp)
  imul   %rcx,%rax
  add    $0xf,%rax
  mov    %rax,%rdx
  and    $0xfffffffffffff000,%rax
  sub    %rax,%rsi
  and    $0xfffffffffffffff0,%rdx
  cmp    %rsi,%rsp
  je     L53
L3:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rsi,%rsp
  jne    L3
L53:
  and    $0xfff,%edx
  sub    %rdx,%rsp
  test   %rdx,%rdx
  jne    L12
L6:
  mov    %rsp,%rbx
  test   %rcx,%rcx
  je     L38
  mov    -0x68(%rbp),%rax
  mov    %rsp,%r12
  xor    %r14d,%r14d
  lea    D25(%rip),%r13
  test   %rax,%rax
  je     L38
  nopw   0x0(%rax,%rax,1)
L65:
  xor    %r15d,%r15d
  nopl   0x0(%rax,%rax,1)
L58:
  lea    (%r15,%r12,1),%rsi
  mov    %r13,%rdi
  xor    %eax,%eax
  add    $0x1,%r15
  call   <scanf@plt>
  mov    -0x50(%rbp),%rax
  cmp    %r15,%rax
  ja     L58
  add    $0x1,%r14
  cmp    -0x58(%rbp),%r14
  jae    L38
  add    -0x68(%rbp),%r12
  test   %rax,%rax
  jne    L65
L38:
  lea    D59(%rip),%rdi
  lea    -0x59(%rbp),%r15
  call   <printf@plt>
  lea    -0x40(%rbp),%r14
  lea    -0x48(%rbp),%r13
  lea    D47(%rip),%r12
  jmp    L107
  nopw   0x0(%rax,%rax,1)
L112:
  lea    D24(%rip),%rdi
  call   <printf@plt>
  mov    -0x50(%rbp),%rsi
  mov    -0x58(%rbp),%rdi
  mov    %rbx,%rdx
  call   <print_screen@plt>
  lea    D46(%rip),%rdi
  call   <printf@plt>
  mov    -0x50(%rbp),%rsi
  mov    -0x58(%rbp),%rdi
  mov    %rbx,%rdx
  movsbl -0x59(%rbp),%r9d
  mov    -0x40(%rbp),%r8
  mov    -0x48(%rbp),%rcx
  call   <paint_fill@plt>
  mov    -0x50(%rbp),%rsi
  mov    -0x58(%rbp),%rdi
  mov    %rbx,%rdx
  call   <print_screen@plt>
L107:
  xor    %eax,%eax
  mov    %r15,%rcx
  mov    %r14,%rdx
  mov    %r13,%rsi
  mov    %r12,%rdi
  call   <scanf@plt>
  cmp    $0x3,%eax
  je     L112
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L0
  lea    -0x28(%rbp),%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
L12:
  orq    $0x0,-0x8(%rsp,%rdx,1)
  jmp    L6
L0:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: label: D16
datatype: string
name: read_data
arguments: label: D7
datatype: string
name: read_data
arguments: label: D25
datatype: string
name: read_data
arguments: label: D59
datatype: string
name: read_data
arguments: label: D47
datatype: string
name: read_data
arguments: label: D24
datatype: string
name: read_data
arguments: label: D46
datatype: string

tool: D16: Enter screen size (X x Y), an each cell's color.


tool: D7: %zu%zu

tool: D25:  %c

tool: D59: 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: D47: %zu%zu %c

tool: D24: Before:


tool: D46: After:


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;
}
```