Given the following C code and assembly code, your task is to generate highly optimized x86-64 assembly code.
C Code:

```c
#include <stdio.h>
int main(void){
    int n, m;
    scanf("%d %d", &n, &m);
    int l, r;
    scanf("%d %d", &l, &r);
    for(int i=1; i<m; i++){
        int a, b;
        scanf("%d %d", &a, &b);
        if(l<a)l=a;
        if(b<r)r=b;
    }
    if(r<l)printf("0\n");
    else printf("%d\n", r-l+1);
    return 0;
}
```

Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%d %d"
.LC1:
	.string	"0"
.LC2:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%r13
	.cfi_def_cfa_offset 16
	.cfi_offset 13, -16
	pushq	%r12
	.cfi_def_cfa_offset 24
	.cfi_offset 12, -24
	pushq	%rbp
	.cfi_def_cfa_offset 32
	.cfi_offset 6, -32
	leaq	.LC0(%rip), %rbp
	pushq	%rbx
	.cfi_def_cfa_offset 40
	.cfi_offset 3, -40
	movq	%rbp, %rdi
	subq	$40, %rsp
	.cfi_def_cfa_offset 80
	movq	%fs:40, %rax
	movq	%rax, 24(%rsp)
	xorl	%eax, %eax
	leaq	4(%rsp), %rdx
	movq	%rsp, %rsi
	call	__isoc99_scanf@PLT
	xorl	%eax, %eax
	leaq	12(%rsp), %rdx
	movq	%rbp, %rdi
	leaq	8(%rsp), %rsi
	call	__isoc99_scanf@PLT
	cmpl	$1, 4(%rsp)
	jle	.L2
	movl	$1, %ebx
	leaq	20(%rsp), %r13
	leaq	16(%rsp), %r12
	.p2align 4,,10
	.p2align 3
.L7:
	movq	%r13, %rdx
	movq	%r12, %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	movl	16(%rsp), %eax
	cmpl	%eax, 8(%rsp)
	jge	.L3
	movl	%eax, 8(%rsp)
.L3:
	movl	20(%rsp), %eax
	movl	12(%rsp), %edx
	cmpl	%edx, %eax
	jge	.L4
	movl	%eax, 12(%rsp)
	addl	$1, %ebx
	cmpl	4(%rsp), %ebx
	jl	.L7
	movl	%eax, %edx
.L6:
	movl	8(%rsp), %eax
	cmpl	%edx, %eax
	jle	.L8
	leaq	.LC1(%rip), %rdi
	call	puts@PLT
.L9:
	movq	24(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L13
	addq	$40, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 40
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 32
	popq	%rbp
	.cfi_def_cfa_offset 24
	popq	%r12
	.cfi_def_cfa_offset 16
	popq	%r13
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L4:
	.cfi_restore_state
	addl	$1, %ebx
	cmpl	%ebx, 4(%rsp)
	jg	.L7
	jmp	.L6
.L8:
	subl	%eax, %edx
	leaq	.LC2(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	addl	$1, %edx
	call	__printf_chk@PLT
	jmp	.L9
.L2:
	movl	12(%rsp), %edx
	jmp	.L6
.L13:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE23:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4:
```

Only output the optimized assembly code. Do not include any other text. Do not write any comments in the assembly code. Wrap the assembly code in ```assembly``` tags.
Optimized Assembly Code:

user
```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%d %d"
.LC1:
	.string	"0"
.LC2:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%r13
	.cfi_def_cfa_offset 16
	.cfi_offset 13, -16
	pushq	%r12
	.cfi_def_cfa_offset 24
	.cfi_offset 12, -24
	pushq	%rbp
	.cfi_def_cfa_offset 32
	.cfi_offset 6, -32
	leaq	.LC0(%rip), %rbp
	pushq	%rbx
	.cfi_def_cfa_offset 40
	.cfi_offset 3, -40
	movq	%rbp, %rdi
	subq	$40, %rsp
	.cfi_def_cfa_offset 80
	movq	%fs:40, %rax
	movq	%rax, 24(%rsp)
	xorl	%eax, %eax
	leaq	4(%rsp), %rdx
	movq	%rsp, %rsi
	call	__isoc99_scanf@PLT
	xorl	%eax, %eax
	leaq	12(%rsp), %rdx
	movq	%rbp, %rdi
	leaq	8(%rsp), %rsi
	call	__isoc99_scanf@PLT
	cmpl	$1, 4(%rsp)
	jle	.L2
	movl	$1, %ebx
	leaq	20(%rsp), %r13
	leaq	16(%rsp), %r12
	.p2align 4,,10
	.p2align 3
.L7:
	movq	%r13, %rdx
	movq	%r12, %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	movl	16(%rsp), %eax
	cmpl	%eax, 8(%rsp)
	jge	.L3
	movl	%eax, 8(%rsp)
.L3:
	movl	20(%rsp), %eax
	movl	12(%rsp), %edx
	cmpl	%edx, %eax
	jge	.L4
	movl	%eax, 12(%rsp)
	addl	$1, %ebx
	cmpl	4(%rsp), %ebx
	jl	.L7
	movl	%eax, %edx
.L6:
	movl	8(%rsp), %eax
	cmpl	%edx, %eax
	jle	.L8
	leaq	.LC1(%rip), %rdi
	call	puts@PLT
.L9:
	movq	24(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L13
	addq	$40, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 40
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 32
	popq	%rbp
	.cfi_def_cfa_offset 24
	popq	%r12
	.cfi_def_cfa_offset 16
	popq	%r13
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L4:
	.cfi_restore_state
	addl	$1, %ebx
	cmpl	%ebx, 4(%rsp)
	jg	.L7
	jmp	.L6
.L8:
	subl	%eax, %edx
	leaq	.LC2(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	addl	$1, %edx
	call	__printf_chk@PLT
	jmp	.L9
.L2:
	movl	12(%rsp), %edx
	jmp	.L6
.L13:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE23:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4:
```
rule
```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%d %d"
.LC1:
	.string	"0"
.LC2:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%r13
	.cfi_def_cfa_offset 16
	.cfi_offset 13, -16
	pushq	%r12
	.cfi_def_cfa_offset 24
	.cfi_offset 12, -24
	pushq	%rbp
	.cfi_def_cfa_offset 32
	.cfi_offset 6, -32
	leaq	.LC0(%rip), %rbp
	pushq	%rbx
	.cfi_def_cfa_offset 40
	.cfi_offset 3, -40
	movq	%rbp, %rdi
	subq	$40, %rsp
	.cfi_def_cfa_offset 80
	movq	%fs:40, %rax
	movq	%rax, 24(%rsp)
	xorl	%eax, %eax
	leaq	4(%rsp), %rdx
	movq	%rsp, %rsi
	call	__isoc99_scanf@PLT
	xorl	%eax, %eax
	leaq	12(%rsp), %rdx
	movq	%rbp, %rdi
	leaq	8(%rsp), %rsi
	call	__isoc99_scanf@PLT
	cmpl	$1, 4(%rsp)
	jle	.L2
	movl	$1, %ebx
	leaq	20(%rsp), %r13
	leaq	16(%rsp), %r12
	.p2align 4,,10
	.p2align 3
.L7:
	movq	%r13, %rdx
	movq	%r12, %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	movl	16(%rsp), %eax
	cmpl	%eax, 8(%rsp)
	jge	.L3
	movl	%eax, 8(%rsp)
.L3:
	movl	20(%rsp), %eax
	movl	12(%rsp), %edx
	cmpl	%edx, %eax
	jge	.L4
	movl	%eax, 12(%rsp)
	addl	$1, %ebx
	cmpl	4(%rsp), %ebx
	jl	.L7
	movl	%eax, %edx
.L6:
	movl	8(%rsp), %eax
	cmpl	%edx, %eax
	jle	.L8
	leaq	.LC1(%rip), %rdi
	call	puts@PLT
.L9:
	movq	24(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L13
	addq	$40, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 40
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 32
	popq	%rbp
	.cfi_def_cfa_offset 24
	popq	%r12
	.cfi_def_cfa_offset 16
	popq	%r13
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L4:
	.cfi_restore_state
	addl	$1, %ebx
	cmpl	%ebx, 4(%rsp)
	jg	.L7
	jmp	.L6
.L8:
	subl	%eax, %edx
	leaq	.LC2(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	addl	$1, %edx
	call	__printf_chk@PLT
	jmp	.L9
.L2:
	movl	12(%rsp), %edx
	jmp	.L6
.L13:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE23:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4:
```
```c
#include <stdio.h>
int main(void){
    int n, m;
    scanf("%d %d", &n, &m);
    int l, r;
    scanf("%d %d", &l, &r);
    for(int i=1; i<m; i++){
        int a, b;
        scanf("%d %d", &a, &b);
        if(l<a)l=a;
        if(b<r)r=b;
    }
    if(r<l)printf("0\n");
    else printf("%d\n", r-l+1);
    return 0;
}
```
Given the following C code, your task is to generate highly optimized x86-64 assembly code.
C Code:

```c
#include <stdio.h>
int main(void){
    int n, m;
    scanf("%d %d", &n, &m);
    int l, r;
    scanf("%d %d", &l, &r);
    for(int i=1; i<m; i++){
        int a, b;
        scanf("%d %d", &a, &b);
        if(l<a)l=a;
        if(b<r)r=b;
    }
    if(r<l)printf("0\n");
    else printf("%d\n", r-l+1);
    return 0;
}
```

Only output the optimized assembly code. Do not include any other text. Do not write any comments in the assembly code. Wrap the assembly code in ```assembly``` tags.
Optimized Assembly Code:

101000 1
1 100000
 4 2
1 6
2 4
 10 3
3 6
7 7
6 9
 101000 1
1 100100
 101000 1
1 100110
 101000 1
1 100010
 101100 1
2 100110
 8 3
1 7
7 7
1 11
 8 1
1 7
7 7
2 11
 4 1
1 4
2 4

100000
 3
 0
 100100
 100110
 100010
 100109
 1
 7
 4

Given the following C code and assembly code, your task is to generate highly optimized x86-64 assembly code.
C Code:

```c
#include <stdio.h>
int main(void){
    int n, m;
    scanf("%d %d", &n, &m);
    int l, r;
    scanf("%d %d", &l, &r);
    for(int i=1; i<m; i++){
        int a, b;
        scanf("%d %d", &a, &b);
        if(l<a)l=a;
        if(b<r)r=b;
    }
    if(r<l)printf("0\n");
    else printf("%d\n", r-l+1);
    return 0;
}
```

Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%d %d"
.LC1:
	.string	"0"
.LC2:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%r13
	.cfi_def_cfa_offset 16
	.cfi_offset 13, -16
	pushq	%r12
	.cfi_def_cfa_offset 24
	.cfi_offset 12, -24
	pushq	%rbp
	.cfi_def_cfa_offset 32
	.cfi_offset 6, -32
	leaq	.LC0(%rip), %rbp
	pushq	%rbx
	.cfi_def_cfa_offset 40
	.cfi_offset 3, -40
	movq	%rbp, %rdi
	subq	$40, %rsp
	.cfi_def_cfa_offset 80
	movq	%fs:40, %rax
	movq	%rax, 24(%rsp)
	xorl	%eax, %eax
	leaq	4(%rsp), %rdx
	movq	%rsp, %rsi
	call	__isoc99_scanf@PLT
	xorl	%eax, %eax
	leaq	12(%rsp), %rdx
	movq	%rbp, %rdi
	leaq	8(%rsp), %rsi
	call	__isoc99_scanf@PLT
	cmpl	$1, 4(%rsp)
	jle	.L2
	movl	$1, %ebx
	leaq	20(%rsp), %r13
	leaq	16(%rsp), %r12
	.p2align 4,,10
	.p2align 3
.L7:
	movq	%r13, %rdx
	movq	%r12, %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	movl	16(%rsp), %eax
	cmpl	%eax, 8(%rsp)
	jge	.L3
	movl	%eax, 8(%rsp)
.L3:
	movl	20(%rsp), %eax
	movl	12(%rsp), %edx
	cmpl	%edx, %eax
	jge	.L4
	movl	%eax, 12(%rsp)
	addl	$1, %ebx
	cmpl	4(%rsp), %ebx
	jl	.L7
	movl	%eax, %edx
.L6:
	movl	8(%rsp), %eax
	cmpl	%edx, %eax
	jle	.L8
	leaq	.LC1(%rip), %rdi
	call	puts@PLT
.L9:
	movq	24(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L13
	addq	$40, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 40
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 32
	popq	%rbp
	.cfi_def_cfa_offset 24
	popq	%r12
	.cfi_def_cfa_offset 16
	popq	%r13
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L4:
	.cfi_restore_state
	addl	$1, %ebx
	cmpl	%ebx, 4(%rsp)
	jg	.L7
	jmp	.L6
.L8:
	subl	%eax, %edx
	leaq	.LC2(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	addl	$1, %edx
	call	__printf_chk@PLT
	jmp	.L9
.L2:
	movl	12(%rsp), %edx
	jmp	.L6
.L13:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE23:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4:
```

Only output the optimized assembly code. Do not include any other text. Do not write any comments in the assembly code. Wrap the assembly code in ```assembly``` tags.
Optimized Assembly Code:

train
```assembly
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%d %d"
.LC1:
	.string	"0"
.LC2:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB23:
	.cfi_startproc
	endbr64
	pushq	%r13
	.cfi_def_cfa_offset 16
	.cfi_offset 13, -16
	pushq	%r12
	.cfi_def_cfa_offset 24
	.cfi_offset 12, -24
	pushq	%rbp
	.cfi_def_cfa_offset 32
	.cfi_offset 6, -32
	leaq	.LC0(%rip), %rbp
	pushq	%rbx
	.cfi_def_cfa_offset 40
	.cfi_offset 3, -40
	movq	%rbp, %rdi
	subq	$40, %rsp
	.cfi_def_cfa_offset 80
	movq	%fs:40, %rax
	movq	%rax, 24(%rsp)
	xorl	%eax, %eax
	leaq	4(%rsp), %rdx
	movq	%rsp, %rsi
	call	__isoc99_scanf@PLT
	xorl	%eax, %eax
	leaq	12(%rsp), %rdx
	movq	%rbp, %rdi
	leaq	8(%rsp), %rsi
	call	__isoc99_scanf@PLT
	cmpl	$1, 4(%rsp)
	jle	.L2
	movl	$1, %ebx
	leaq	20(%rsp), %r13
	leaq	16(%rsp), %r12
	.p2align 4,,10
	.p2align 3
.L7:
	movq	%r13, %rdx
	movq	%r12, %rsi
	movq	%rbp, %rdi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	movl	16(%rsp), %eax
	cmpl	%eax, 8(%rsp)
	jge	.L3
	movl	%eax, 8(%rsp)
.L3:
	movl	20(%rsp), %eax
	movl	12(%rsp), %edx
	cmpl	%edx, %eax
	jge	.L4
	movl	%eax, 12(%rsp)
	addl	$1, %ebx
	cmpl	4(%rsp), %ebx
	jl	.L7
	movl	%eax, %edx
.L6:
	movl	8(%rsp), %eax
	cmpl	%edx, %eax
	jle	.L8
	leaq	.LC1(%rip), %rdi
	call	puts@PLT
.L9:
	movq	24(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L13
	addq	$40, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 40
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 32
	popq	%rbp
	.cfi_def_cfa_offset 24
	popq	%r12
	.cfi_def_cfa_offset 16
	popq	%r13
	.cfi_def_cfa_offset 8
	ret
	.p2align 4,,10
	.p2align 3
.L4:
	.cfi_restore_state
	addl	$1, %ebx
	cmpl	%ebx, 4(%rsp)
	jg	.L7
	jmp	.L6
.L8:
	subl	%eax, %edx
	leaq	.LC2(%rip), %rsi
	movl	$1, %edi
	xorl	%eax, %eax
	addl	$1, %edx
	call	__printf_chk@PLT
	jmp	.L9
.L2:
	movl	12(%rsp), %edx
	jmp	.L6
.L13:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE23:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4:
```