Rust vs Go:常用语法对比

这个网站 可以列出某门编程语言的常用语法，也可以对比两种语言的基本语法差别。

在此对比Go和Rust


1. <font color="d9ed92">Print Hello World</font>

打印Hello World

package main

import "fmt"


func main() {
    fmt.Println("Hello World")
}


fn main() {
    println!("Hello World");
}

Rust 输出文字的方式主要有两种：println!() 和 print!()。这两个"函数"都是向命令行输出字符串的方法，区别仅在于前者会在输出的最后附加输出一个换行符。当用这两个"函数"输出信息的时候，第一个参数是格式字符串，后面是一串可变参数，对应着格式字符串中的"占位符"，这一点与 C 语言/ Go语言 中的 printf 函数很相似。但是，Rust 中格式字符串中的占位符不是"% + 字母"的形式，而是一对 {}。


2. <font color="b5e48c">Print Hello 10 times</font>

打印10次Hello World

package main

import (
    "fmt"
)

func main() {
    for i := 0; i < 10; i++ {
        fmt.Println("Hello")
    }
}

or

package main

import (
    "fmt"
    "strings"
)

func main() {

    fmt.Print(strings.Repeat("Hello\n", 10))

}

fn main() {
    for _ in 0..10 {
        println!("Hello");
    }
}

or

fn main() {
    print!("{}", "Hello\n".repeat(10));
}


3. <font color="99d98c">Create a procedure</font>

Like a function which doesn't return any value, thus has only side effects (e.g. Print to standard output)

创建一个方法，没有返回值，打印一些内容

package main

import "fmt"

func finish(name string) {
    fmt.Println("My job here is done. Good bye " + name)
}

func main() {
    finish("Tony")
}


fn main(){
    finish("Buddy")
}

fn finish(name : &str) {
    println!("My job here is done. Goodbye {}", name);
}


4. <font color="76c893">Create a function which returns the square of an integer</font>

创建一个函数,返回一个整数的平方

func square(x int) int {
  return x*x
}


fn square(x: u32) -> u32 {
    x * x
}

fn main() {
    let sq = square(9);

    println!("{}", sq);
}


5. <font color="52b69a">Create a 2D Point data structure</font>

Declare a container type for two floating-point numbers x and y

声明一个容器类型,有x、y两个浮点数

package main

import "fmt"

type Point struct {
    x, y float64
}

func main() {
    p1 := Point{}
    p2 := Point{2.1, 2.2}
    p3 := Point{
        y: 3.1,
        x: 3.2,
    }
    p4 := &Point{
        x: 4.1,
        y: 4.2,
    }

    fmt.Println(p1)
    fmt.Println(p2)
    fmt.Println(p3)
    fmt.Println(p4)
}

输出

{0 0}
{2.1 2.2}
{3.2 3.1}
&{4.1 4.2}


use std::fmt;

struct Point {
    x: f64,
    y: f64,
}

impl fmt::Display for Point {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "({}, {})", self.x, self.y)
    }
}

fn main() {
    let p = Point { x: 2.0, y: -3.5 };

    println!("{}", p);
}

or

use std::fmt;

struct Point(f64, f64);

impl fmt::Display for Point {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "({}, {})", self.0, self.1)
    }
}

fn main() {
    let p = Point(2.0, -3.5);

    println!("{}", p);
}


6. <font color="34a0a4">Iterate over list values</font>

Do something with each item x of an array-like collection items, regardless indexes.

遍历列表的值

for _, x := range items {
    doSomething(x)
}


package main

import (
    "fmt"
)

func main() {
    items := []int{11, 22, 33}

    for _, x := range items {
        doSomething(x)
    }
}

func doSomething(i int) {
    fmt.Println(i)
}

输出

11
22
33

fn main() {
    let items = vec![11, 22, 33];

    for x in items {
        do_something(x);
    }
}

fn do_something(n: i64) {
    println!("Number {}", n)
}

or

fn main() {
    let items = vec![11, 22, 33];

    items.into_iter().for_each(|x| do_something(x));
}

fn do_something(n: i64) {
    println!("Number {}", n)
}


7. <font color="168aad">Iterate over list indexes and values</font>

遍历列表的索引和值

package main

import "fmt"

func main() {
    items := []string{
        "oranges",
        "apples",
        "bananas",
    }

    for i, x := range items {
        fmt.Printf("Item %d = %v \n", i, x)
    }
}

输出

Item 0 = oranges 
Item 1 = apples 
Item 2 = bananas 

fn main() {
    let items = ["a", "b", "c"];
    for (i, x) in items.iter().enumerate() {
        println!("Item {} = {}", i, x);
    }
}

or

fn main() {
    let items = ["a", "b", "c"];
    items.iter().enumerate().for_each(|(i, x)| {
        println!("Item {} = {}", i, x);
    });
}


8. <font color="1a759f">Initialize a new map (associative array)</font>

Create a new map object x, and provide some (key, value) pairs as initial content.

创建一个新的map,提供一些键值对 作为初始内容

package main

import "fmt"

func main() {
    x := map[string]int{"one": 1, "two": 2}

    fmt.Println(x)
}

输出

map[one:1 two:2]

use std::collections::BTreeMap;

fn main() {
    let mut x = BTreeMap::new();
    x.insert("one", 1);
    x.insert("two", 2);
    
    println!("{:?}", x);
}

输出为：

("one", 1)
("two", 2)

or

use std::collections::HashMap;

fn main() {
    let x: HashMap<&str, i32> = [
        ("one", 1),
        ("two", 2),
    ].iter().cloned().collect();
    
    println!("{:?}", x);
}

输出为：

("two", 2)
("one", 1)

分 BTreeMap 和 HashMap，且都需要use进来； 前者无序，后者有序


9. <font color="1e6091">Create a Binary Tree data structure</font>

The structure must be recursive because left child and right child are binary trees too. A node has access to children nodes, but not to its parent.

创建一个二叉树

type BinTree struct {
    Value valueType
    Left *BinTree
    Right *BinTree
}

package main

import "fmt"

type BinTree struct {
    Value int
    Left  *BinTree
    Right *BinTree
}

func inorder(root *BinTree) {
    if root == nil {
        return
    }

    inorder(root.Left)
    fmt.Printf("%d ", root.Value)
    inorder(root.Right)
}

func main() {
    root := &BinTree{1, nil, nil}
    root.Left = &BinTree{2, nil, nil}
    root.Right = &BinTree{3, nil, nil}
    root.Left.Left = &BinTree{4, nil, nil}
    root.Left.Right = &BinTree{5, nil, nil}
    root.Right.Right = &BinTree{6, nil, nil}
    root.Left.Left.Left = &BinTree{7, nil, nil}

    inorder(root)
}

输出

7 4 2 5 1 3 6 

struct BinTree<T> {
    value: T,
    left: Option<Box<BinTree<T>>>,
    right: Option<Box<BinTree<T>>>,
}


10. <font color="184e77">Shuffle a list</font>

Generate a random permutation of the elements of list x

随机排序一个list

package main

import (
    "fmt"
    "math/rand"
)

func main() {
    x := []string{"a", "b", "c", "d", "e", "f", "g", "h"}

    for i := range x {
        j := rand.Intn(i + 1)
        x[i], x[j] = x[j], x[i]
    }

    fmt.Println(x)
}

输出

[f e c g h a d b]

or

package main

import (
    "fmt"
    "math/rand"
)

func main() {
    x := []string{"a", "b", "c", "d", "e", "f", "g", "h"}

    y := make([]string, len(x))
    perm := rand.Perm(len(x))
    for i, v := range perm {
        y[v] = x[i]
    }

    fmt.Println(y)
}

输出

[f h c g b a d e]

<font size=1 color="orange">

rand.Perm(x)挺有意思的一个函数，perm应该是permutation的缩写，即置换，排列。

会输出一个从0-(x-1)随机顺序排列的数组，类似洗牌，总数不变，打乱顺序

</font>

or

package main

import (
    "fmt"
    "math/rand"
)

func main() {
    x := []string{"a", "b", "c", "d", "e", "f", "g", "h"}

    rand.Shuffle(len(x), func(i, j int) {
        x[i], x[j] = x[j], x[i]
    })

    fmt.Println(x)
}

输出

[f a h b c d g e]

or

package main

import (
    "fmt"
    "math/rand"
)

func main() {
    x := []string{"a", "b", "c", "d", "e", "f", "g", "h"}

    for i := len(x) - 1; i > 0; i-- {
        j := rand.Intn(i + 1)
        x[i], x[j] = x[j], x[i]
    }

    fmt.Println(x)
}

输出

[g d a h e f c b]

extern crate rand;
use rand::{Rng, StdRng};

let mut rng = StdRng::new().unwrap();
rng.shuffle(&mut x);

or

use rand::seq::SliceRandom;
use rand::thread_rng;

fn main() {
    let mut x = [1, 2, 3, 4, 5];
    println!("Unshuffled: {:?}", x);

    let mut rng = thread_rng();
    x.shuffle(&mut rng);

    println!("Shuffled:   {:?}", x);
}


11. <font color="f72585">Pick a random element from a list</font>

从列表中选择一个随机元素

package main

import (
    "fmt"
    "math/rand"
)

var x = []string{"bleen", "fuligin", "garrow", "grue", "hooloovoo"}

func main() {
    fmt.Println(x[rand.Intn(len(x))])
}

输出

fuligin

or

package main

import (
    "fmt"
    "math/rand"
)

type T string

func pickT(x []T) T {
    return x[rand.Intn(len(x))]
}

func main() {
    var list = []T{"bleen", "fuligin", "garrow", "grue", "hooloovoo"}
    fmt.Println(pickT(list))
}

输出

fuligin

use rand::{self, Rng};

fn main() {
    let x = vec![11, 22, 33];

    let choice = x[rand::thread_rng().gen_range(0..x.len())];

    println!("I picked {}!", choice);
}

or

use rand::seq::SliceRandom;
 
fn main() {
    let x = vec![11, 22, 33];

    let mut rng = rand::thread_rng();
    let choice = x.choose(&mut rng).unwrap();
    
    println!("I picked {}!", choice);
}


12. <font color="b5179e">Check if list contains a value</font>

Check if list contains a value x.
list is an iterable finite container.

检查列表中是否包含一个值

package main

import "fmt"

func Contains(list []T, x T) bool {
    for _, item := range list {
        if item == x {
            return true
        }
    }
    return false
}

type T string

func main() {
    list := []T{"a", "b", "c"}
    fmt.Println(Contains(list, "b"))
    fmt.Println(Contains(list, "z"))
}

输出

true
false

fn main() {
    let list = [10, 40, 30];

    {
        let num = 30;

        if list.contains(&num) {
            println!("{:?} contains {}", list, num);
        } else {
            println!("{:?} doesn't contain {}", list, num);
        }
    }

    {
        let num = 42;

        if list.contains(&num) {
            println!("{:?} contains {}", list, num);
        } else {
            println!("{:?} doesn't contain {}", list, num);
        }
    }
}

or

fn main() {
    let list = [10, 40, 30];
    let x = 30;

    if list.iter().any(|v| v == &x) {
        println!("{:?} contains {}", list, x);
    } else {
        println!("{:?} doesn't contain {}", list, x);
    }
}

or

fn main() {
    let list = [10, 40, 30];
    let x = 30;

    if (&list).into_iter().any(|v| v == &x) {
        println!("{:?} contains {}", list, x);
    } else {
        println!("{:?} doesn't contain {}", list, x);
    }
}


13. <font color="7209b7">Iterate over map keys and values</font>

Access each key k with its value x from an associative array mymap, and print them

遍历关联数组中的每一对 k-v， 并打印出它们

package main

import "fmt"

func main() {
    mymap := map[string]int{
        "one":   1,
        "two":   2,
        "three": 3,
        "four":  4,
    }

    for k, x := range mymap {
        fmt.Println("Key =", k, ", Value =", x)
    }
}

输出

Key = two , Value = 2
Key = three , Value = 3
Key = four , Value = 4
Key = one , Value = 1

use std::collections::BTreeMap;

fn main() {
    let mut mymap = BTreeMap::new();
    mymap.insert("one", 1);
    mymap.insert("two", 2);
    mymap.insert("three", 3);
    mymap.insert("four", 4);

    for (k, x) in &mymap {
        println!("Key={key}, Value={val}", key = k, val = x);
    }
}


14. <font color="560bad">Pick uniformly a random floating point number in [a..b)</font>

Pick a random number greater than or equals to a, strictly inferior to b. Precondition : a < b.

选出一个随机的浮点数，大于或等于a，严格小于b，且a< b

package main

import (
    "fmt"
    "math/rand"
)

func main() {
    x := pick(-2.0, 6.5)
    fmt.Println(x)
}

func pick(a, b float64) float64 {
    return a + (rand.Float64() * (b - a))
}

输出

3.1396124478267664

extern crate rand;
use rand::{thread_rng, Rng};

fn main() {
    let (a, b) = (1.0, 3.0);
    let c = thread_rng().gen_range(a..b);
    println!("{}", c);
}


15. <font color="3f37c9">Pick uniformly a random integer in [a..b]</font>

Pick a random integer greater than or equals to a, inferior or equals to b. Precondition : a < b.

选出一个随机的整数，大于或等于a，小于或等于b，且a< b

package main

import (
    "fmt"
    "math/rand"
)

func main() {
    x := pick(3, 7)

    // Note that in the Go Playground, time and random don't change very often.
    fmt.Println(x)
}

func pick(a, b int) int {
    return a + rand.Intn(b-a+1)
}

输出

4

fn pick(a: i32, b: i32) -> i32 {
    let between = Range::new(a, b);
    let mut rng = rand::thread_rng();
    between.ind_sample(&mut rng)
}

or

use rand::distributions::Distribution;
use rand::distributions::Uniform;

fn main() {
    let (a, b) = (3, 5);

    let x = Uniform::new_inclusive(a, b).sample(&mut rand::thread_rng());

    println!("{}", x);
}


17. <font color="4361ee">Create a Tree data structure</font>

The structure must be recursive. A node may have zero or more children. A node has access to children nodes, but not to its parent.

创建树数据结构,
该结构必须是递归的。一个节点可以有零个或多个子节点,节点可以访问子节点，但不能访问其父节点

type Tree struct {
    Key keyType
    Deco valueType
    Children []*Tree
}

package main

import "fmt"

type Tree struct {
    Key      key
    Deco     value
    Children []*Tree
}

type key string
type value string

func (t *Tree) String() string {
    str := "("
    str += string(t.Deco)
    if len(t.Children) == 0 {
        return str + ")"
    }
    str += " ("
    for _, child := range t.Children {
        str += child.String()
    }
    str += "))"
    return str
}

func (this *Tree) AddChild(x key, v value) *Tree {
    child := &Tree{Key: x, Deco: v}
    this.Children = append(this.Children, child)
    return child
}

func main() {
    tree := &Tree{Key: "Granpa", Deco: "Abraham"}
    subtree := tree.AddChild("Dad", "Homer")
    subtree.AddChild("Kid 1", "Bart")
    subtree.AddChild("Kid 2", "Lisa")
    subtree.AddChild("Kid 3", "Maggie")

    fmt.Println(tree)
}

输出

(Abraham ((Homer ((Bart)(Lisa)(Maggie)))))

use std::vec;

struct Node<T> {
    value: T,
    children: Vec<Node<T>>,
}

impl<T> Node<T> {
    pub fn dfs<F: Fn(&T)>(&self, f: F) {
       self.dfs_helper(&f);
    }

    fn dfs_helper<F: Fn(&T)>(&self, f: &F) {
        (f)(&self.value);
        for child in &self.children {
            child.dfs_helper(f);
        }
    }
}


fn main() {
    let t: Node<i32> = Node {
        children: vec![
            Node {
                children: vec![
                    Node {
                        children: vec![],
                        value: 14
                    }
                ],
                value: 28
            },
            Node {
                children: vec![],
                value: 80
            }
        ],
        value: 50
    };

    t.dfs(|node| { println!("{}", node); });
}

输出：

50
28
14
80


18. <font color="4895ef">Depth-first traversing of a tree</font>

Call a function f on every node of a tree, in depth-first prefix order

树的深度优先遍历。按照深度优先的前缀顺序，在树的每个节点上调用函数f

package main

import . "fmt"

func (t *Tree) Dfs(f func(*Tree)) {
    if t == nil {
        return
    }
    f(t)
    for _, child := range t.Children {
        child.Dfs(f)
    }
}

type key string
type value string

type Tree struct {
    Key      key
    Deco     value
    Children []*Tree
}

func (this *Tree) AddChild(x key, v value) {
    child := &Tree{Key: x, Deco: v}
    this.Children = append(this.Children, child)
}

func NodePrint(node *Tree) {
    Printf("%v (%v)\n", node.Deco, node.Key)
}

func main() {
    tree := &Tree{Key: "Granpa", Deco: "Abraham"}
    tree.AddChild("Dad", "Homer")
    tree.Children[0].AddChild("Kid 1", "Bart")
    tree.Children[0].AddChild("Kid 2", "Lisa")
    tree.Children[0].AddChild("Kid 3", "Maggie")

    tree.Dfs(NodePrint)
}

输出

Abraham (Granpa)
Homer (Dad)
Bart (Kid 1)
Lisa (Kid 2)
Maggie (Kid 3)

use std::vec;

struct Tree<T> {
    children: Vec<Tree<T>>,
    value: T
}

impl<T> Tree<T> {
    pub fn new(value: T) -> Self{
        Tree{
            children: vec![],
            value
        }
    }

    pub fn dfs<F: Fn(&T)>(&self, f: F) {
       self.dfs_helper(&f);
    }

    fn dfs_helper<F: Fn(&T)>(&self, f: &F) {
        (f)(&self.value);
        for child in &self.children {
            child.dfs_helper(f);
        }
    }
}


fn main() {
    let t: Tree<i32> = Tree {
        children: vec![
            Tree {
                children: vec![
                    Tree {
                        children: vec![],
                        value: 14
                    }
                ],
                value: 28
            },
            Tree {
                children: vec![],
                value: 80
            }
        ],
        value: 50
    };

    t.dfs(|node| { println!("{}", node); });
}

输出：

50
28
14
80


19. <font color="4895ef">Reverse a list</font>

Reverse the order of the elements of list x.
This may reverse "in-place" and destroy the original ordering.

反转链表

package main

import "fmt"

func main() {

    s := []int{5, 2, 6, 3, 1, 4}

    for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
        s[i], s[j] = s[j], s[i]
    }

    fmt.Println(s)
}

输出

[4 1 3 6 2 5]

fn main() {
    let x = vec!["Hello", "World"];
    let y: Vec<_> = x.iter().rev().collect();
    println!("{:?}", y);
}

输出：

["World", "Hello"]

or

fn main() {
    let mut x = vec![1,2,3];
    x.reverse();
    println!("{:?}", x);
}

输出:

[3, 2, 1]


20. <font color="14213d">Return two values</font>

Implement a function search which looks for item x in a 2D matrix m.
Return indices i, j of the matching cell.
Think of the most idiomatic way in the language to return the two values at the same time.

实现在2D矩阵m中寻找元素x，返回匹配单元格的索引 i，j

package main

import "fmt"

func search(m [][]int, x int) (bool, int, int) {
    for i := range m {
        for j, v := range m[i] {
            if v == x {
                return true, i, j
            }
        }
    }
    return false, 0, 0
}

func main() {
    matrix := [][]int{
        {1, 2, 3},
        {4, 5, 6},
        {7, 8, 9},
    }
    for x := 1; x <= 11; x += 2 {
        found, i, j := search(matrix, x)
        if found {
            fmt.Printf("matrix[%v][%v] == %v \n", i, j, x)
        } else {
            fmt.Printf("Value %v not found. \n", x)
        }
    }
}

输出

matrix[0][0] == 1 
matrix[0][2] == 3 
matrix[1][1] == 5 
matrix[2][0] == 7 
matrix[2][2] == 9 
Value 11 not found. 

fn search<T: Eq>(m: &Vec<Vec<T>>, x: &T) -> Option<(usize, usize)> {
    for (i, row) in m.iter().enumerate() {
        for (j, column) in row.iter().enumerate() {
            if *column == *x {
                return Some((i, j));
            }
        }
    }
    
    None
}

fn main() {
    let a = vec![
        vec![0, 11],
        vec![22, 33],
        vec![44, 55],
    ];
    
    let hit = search(&a, &33);
    
    println!("{:?}", hit);
}

输出：

Some((1, 1))


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  • 人面猴
    序言：七十年代末，一起剥皮案震惊了整个滨河市，随后出现的几起案子，更是在滨河造成了极大的恐慌，老刑警刘岩，带你破解...
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  • 死咒
    序言：滨河连续发生了三起死亡事件，死亡现场离奇诡异，居然都是意外死亡，警方通过查阅死者的电脑和手机，发现死者居然都...
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  • 救了他两次的神仙让他今天三更去死
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  • 道士缉凶录：失踪的卖姜人
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  • 港岛之恋（遗憾婚礼）
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  • 恶毒庶女顶嫁案：这布局不是一般人想出来的
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  • 城市分裂传说
    那天，我揣着相机与录音，去河边找鬼。 笑死，一个胖子当着我的面吹牛，可吹牛的内容都是我干的。 我是一名探鬼主播，决...
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  • 双鸳鸯连环套：你想象不到人心有多黑
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  • 万荣杀人案实录
    序言：老挝万荣一对情侣失踪，失踪者是张志新（化名）和其女友刘颖，没想到半个月后，有当地人在树林里发现了一具尸体，经...
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  • 护林员之死
    正文 独居荒郊野岭守林人离奇死亡，尸身上长有42处带血的脓包…… 初始之章·张勋 以下内容为张勋视角 年9月15日...
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  • 白月光启示录
    正文 我和宋清朗相恋三年，在试婚纱的时候发现自己被绿了。 大学时的朋友给我发了我未婚夫和他白月光在一起吃饭的照片。...
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  • 活死人
    序言：一个原本活蹦乱跳的男人离奇死亡，死状恐怖，灵堂内的尸体忽然破棺而出，到底是诈尸还是另有隐情，我是刑警宁泽，带...
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  • 日本核电站爆炸内幕
    正文 年R本政府宣布，位于F岛的核电站，受9级特大地震影响，放射性物质发生泄漏。R本人自食恶果不足惜，却给世界环境...
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  • 男人毒药：我在死后第九天来索命
    文/蒙蒙 一、第九天 我趴在偏房一处隐蔽的房顶上张望。 院中可真热闹，春花似锦、人声如沸。这庄子的主人今日做“春日...
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  • 一桩弑父案，背后竟有这般阴谋
    文/苍兰香墨 我抬头看了看天上的太阳。三九已至，却和暖如春，着一层夹袄步出监牢的瞬间，已是汗流浃背。 一阵脚步声响...
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  • 情欲美人皮
    我被黑心中介骗来泰国打工， 没想到刚下飞机就差点儿被人妖公主榨干…… 1. 我叫王不留，地道东北人。 一个月前我还...
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  • 代替公主和亲
    正文 我出身青楼，却偏偏与公主长得像，于是被迫代替她去往敌国和亲。 传闻我的和亲对象是个残疾皇子，可洞房花烛夜当晚...
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