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add leetcode problem-cn part2

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<p>给你一个字符串 <code>s</code> 和一个字符串数组 <code>words</code> ,请你判断 <code>s</code> 是否为 <code>words</code><strong>前缀字符串</strong></p>
<p>字符串 <code>s</code> 要成为 <code>words</code><strong>前缀字符串</strong> ,需要满足:<code>s</code> 可以由 <code>words</code> 中的前 <code>k</code><code>k</code><strong>正数</strong> )个字符串按顺序相连得到,且 <code>k</code> 不超过 <code>words.length</code></p>
<p>如果 <code>s</code><code>words</code><strong>前缀字符串</strong> ,返回 <code>true</code> ;否则,返回 <code>false</code></p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>s = "iloveleetcode", words = ["i","love","leetcode","apples"]
<strong>输出:</strong>true
<strong>解释:</strong>
s 可以由 "i"、"love" 和 "leetcode" 相连得到。
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>s = "iloveleetcode", words = ["apples","i","love","leetcode"]
<strong>输出:</strong>false
<strong>解释:</strong>
数组的前缀相连无法得到 s 。</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= words.length &lt;= 100</code></li>
<li><code>1 &lt;= words[i].length &lt;= 20</code></li>
<li><code>1 &lt;= s.length &lt;= 1000</code></li>
<li><code>words[i]</code><code>s</code> 仅由小写英文字母组成</li>
</ul>