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# 合并两个有序的数组

![last modify](https://img.shields.io/static/v1?label=last%20modify\&message=2022-10-14%2014%3A59%3A33\&color=yellowgreen\&style=flat-square) [![](https://img.shields.io/static/v1?label=\&message=%E4%B8%AD%E7%AD%89\&color=yellow\&style=flat-square)](https://imhuay.gitbook.io/studies/algorithms/problems/2022/01/pages/R5NyOzkn3qAZy7wCx1pS#中等) [![](https://img.shields.io/static/v1?label=\&message=%E7%89%9B%E5%AE%A2\&color=green\&style=flat-square)](https://imhuay.gitbook.io/studies/algorithms/problems/2022/01/pages/R5NyOzkn3qAZy7wCx1pS#牛客) [![](https://img.shields.io/static/v1?label=\&message=%E5%8F%8C%E6%8C%87%E9%92%88\&color=blue\&style=flat-square)](https://imhuay.gitbook.io/studies/algorithms/problems/2022/01/pages/R5NyOzkn3qAZy7wCx1pS#双指针)

**问题简述**

```
给定两个有序数组 A 和 B，请将数组 B 合并到数组 A 中；
A 和 B 中初始的元素数目分别为 m 和 n，A 的数组空间大小为 m + n；
要求不使用额外空间。
```

> [合并两个有序的数组\_牛客题霸\_牛客网](https://www.nowcoder.com/practice/89865d4375634fc484f3a24b7fe65665)

**思路**

* 双指针 + 逆序填空；

<details>

<summary><strong>Python</strong></summary>

```python
#
# 
# @param A int整型一维数组 
# @param B int整型一维数组 
# @return void
#
class Solution:
    def merge(self , A, m, B, n):
        # write code here
        i, j = m - 1, n - 1
        p = m + n - 1
        
        while i >= 0 and j >= 0:
            if A[i] > B[j]:
                A[p] = A[i]
                i -= 1
            else:
                A[p] = B[j]
                j -= 1
            p -= 1
        
        while j >= 0:
            A[p] = B[j]
            j -= 1
            p -= 1
```

</details>


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