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add leetcode problem-cn part2

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<p>哦,不!你不小心把一个长篇文章中的空格、标点都删掉了,并且大写也弄成了小写。像句子<code>&quot;I reset the computer. It still didn&rsquo;t boot!&quot;</code>已经变成了<code>&quot;iresetthecomputeritstilldidntboot&quot;</code>。在处理标点符号和大小写之前,你得先把它断成词语。当然了,你有一本厚厚的词典<code>dictionary</code>,不过,有些词没在词典里。假设文章用<code>sentence</code>表示,设计一个算法,把文章断开,要求未识别的字符最少,返回未识别的字符数。</p>
<p><strong>注意:</strong>本题相对原题稍作改动,只需返回未识别的字符数</p>
<p>&nbsp;</p>
<p><strong>示例:</strong></p>
<pre><strong>输入:</strong>
dictionary = [&quot;looked&quot;,&quot;just&quot;,&quot;like&quot;,&quot;her&quot;,&quot;brother&quot;]
sentence = &quot;jesslookedjustliketimherbrother&quot;
<strong>输出:</strong> 7
<strong>解释:</strong> 断句后为&quot;<strong>jess</strong> looked just like <strong>tim</strong> her brother&quot;共7个未识别字符。
</pre>
<p><strong>提示:</strong></p>
<ul>
<li><code>0 &lt;= len(sentence) &lt;= 1000</code></li>
<li><code>dictionary</code>中总字符数不超过 150000。</li>
<li>你可以认为<code>dictionary</code><code>sentence</code>中只包含小写字母。</li>
</ul>