# 连接词
<p>给定一个 <strong>不含重复 </strong>单词的字符串数组 <code>words</code> ，编写一个程序，返回&nbsp;<code>words</code> 中的所有 <strong>连接词</strong> 。</p>

<p><strong>连接词</strong> 的定义为：一个字符串完全是由至少两个给定数组中的单词组成的。</p>

<p>&nbsp;</p>

<p><strong>示例 1：</strong></p>

<pre>
<strong>输入：</strong>words = ["cat","cats","catsdogcats","dog","dogcatsdog","hippopotamuses","rat","ratcatdogcat"]
<strong>输出：</strong>["catsdogcats","dogcatsdog","ratcatdogcat"]
<strong>解释：</strong>"catsdogcats"由"cats", "dog" 和 "cats"组成; 
     "dogcatsdog"由"dog", "cats"和"dog"组成; 
     "ratcatdogcat"由"rat", "cat", "dog"和"cat"组成。
</pre>

<p><strong>示例 2：</strong></p>

<pre>
<strong>输入：</strong>words = ["cat","dog","catdog"]
<strong>输出：</strong>["catdog"]</pre>

<p>&nbsp;</p>

<p><strong>提示：</strong></p>

<ul>
	<li><code>1 &lt;= words.length &lt;= 10<sup>4</sup></code></li>
	<li><code>0 &lt;= words[i].length &lt;= 1000</code></li>
	<li><code>words[i]</code> 仅由小写字母组成</li>
	<li><code>0 &lt;= sum(words[i].length) &lt;= 10<sup>5</sup></code></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

```
