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leetcode-cn/problem (English)/单词规律(English) [word-pattern].html
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<p>Given a <code>pattern</code> and a string <code>s</code>, find if <code>s</code>&nbsp;follows the same pattern.</p>
<p>Here <b>follow</b> means a full match, such that there is a bijection between a letter in <code>pattern</code> and a <b>non-empty</b> word in <code>s</code>.</p>
<p>Here <b>follow</b> means a full match, such that there is a bijection between a letter in <code>pattern</code> and a <b>non-empty</b> word in <code>s</code>. Specifically:</p>
<ul>
<li>Each letter in <code>pattern</code> maps to <strong>exactly</strong> one unique word in <code>s</code>.</li>
<li>Each unique word in <code>s</code> maps to <strong>exactly</strong> one letter in <code>pattern</code>.</li>
<li>No two letters map to the same word, and no two words map to the same letter.</li>
</ul>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre>
<strong>Input:</strong> pattern = &quot;abba&quot;, s = &quot;dog cat cat dog&quot;
<strong>Output:</strong> true
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">pattern = &quot;abba&quot;, s = &quot;dog cat cat dog&quot;</span></p>
<p><strong>Output:</strong> <span class="example-io">true</span></p>
<p><strong>Explanation:</strong></p>
<p>The bijection can be established as:</p>
<ul>
<li><code>&#39;a&#39;</code> maps to <code>&quot;dog&quot;</code>.</li>
<li><code>&#39;b&#39;</code> maps to <code>&quot;cat&quot;</code>.</li>
</ul>
</div>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> pattern = &quot;abba&quot;, s = &quot;dog cat cat fish&quot;
<strong>Output:</strong> false
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">pattern = &quot;abba&quot;, s = &quot;dog cat cat fish&quot;</span></p>
<p><strong>Output:</strong> <span class="example-io">false</span></p>
</div>
<p><strong class="example">Example 3:</strong></p>
<pre>
<strong>Input:</strong> pattern = &quot;aaaa&quot;, s = &quot;dog cat cat dog&quot;
<strong>Output:</strong> false
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">pattern = &quot;aaaa&quot;, s = &quot;dog cat cat dog&quot;</span></p>
<p><strong>Output:</strong> <span class="example-io">false</span></p>
</div>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>