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leetcode/771-jewels-and-stones/README.md
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<h2><a href="https://leetcode.com/problems/jewels-and-stones/">771. Jewels and Stones</a></h2><h3>Easy</h3><hr><div><p>You're given strings <code>jewels</code> representing the types of stones that are jewels, and <code>stones</code> representing the stones you have. Each character in <code>stones</code> is a type of stone you have. You want to know how many of the stones you have are also jewels.</p>
<p>Letters are case sensitive, so <code>"a"</code> is considered a different type of stone from <code>"A"</code>.</p>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre><strong>Input:</strong> jewels = "aA", stones = "aAAbbbb"
<strong>Output:</strong> 3
</pre><p><strong class="example">Example 2:</strong></p>
<pre><strong>Input:</strong> jewels = "z", stones = "ZZ"
<strong>Output:</strong> 0
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;=&nbsp;jewels.length, stones.length &lt;= 50</code></li>
<li><code>jewels</code> and <code>stones</code> consist of only English letters.</li>
<li>All the characters of&nbsp;<code>jewels</code> are <strong>unique</strong>.</li>
</ul>
</div>