# 两数之和

<p>给你一个列表&nbsp;<code>nums</code>&nbsp;，里面每一个元素都是一个整数列表。请你依照下面各图的规则，按顺序返回&nbsp;<code>nums</code>&nbsp;中对角线上的整数。</p>

<p>&nbsp;</p>

<p><strong>示例 1：</strong></p>

<p><strong><img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/04/23/sample_1_1784.png" style="height: 143px; width: 158px;"></strong></p>

<pre><strong>输入：</strong>nums = [[1,2,3],[4,5,6],[7,8,9]]
<strong>输出：</strong>[1,4,2,7,5,3,8,6,9]
</pre>

<p><strong>示例 2：</strong></p>

<p><strong><img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/04/23/sample_2_1784.png" style="height: 177px; width: 230px;"></strong></p>

<pre><strong>输入：</strong>nums = [[1,2,3,4,5],[6,7],[8],[9,10,11],[12,13,14,15,16]]
<strong>输出：</strong>[1,6,2,8,7,3,9,4,12,10,5,13,11,14,15,16]
</pre>

<p><strong>示例 3：</strong></p>

<pre><strong>输入：</strong>nums = [[1,2,3],[4],[5,6,7],[8],[9,10,11]]
<strong>输出：</strong>[1,4,2,5,3,8,6,9,7,10,11]
</pre>

<p><strong>示例 4：</strong></p>

<pre><strong>输入：</strong>nums = [[1,2,3,4,5,6]]
<strong>输出：</strong>[1,2,3,4,5,6]
</pre>

<p>&nbsp;</p>

<p><strong>提示：</strong></p>

<ul>
	<li><code>1 &lt;= nums.length &lt;= 10^5</code></li>
	<li><code>1 &lt;= nums[i].length &lt;=&nbsp;10^5</code></li>
	<li><code>1 &lt;= nums[i][j] &lt;= 10^9</code></li>
	<li><code>nums</code>&nbsp;中最多有&nbsp;<code>10^5</code>&nbsp;个数字。</li>
</ul>

<p>以下错误的选项是？</p>

## aop
### before
```cpp

```
### after
```cpp

```

## 答案
```cpp

```
## 选项

### A
```cpp

```

### B
```cpp

```

### C
```cpp

```
