leetcode-problemset/leetcode/originData/unique-email-addresses.json

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            "title": "Unique Email Addresses",
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            "content": "<p>Every <strong>valid email</strong> consists of a <strong>local name</strong> and a <strong>domain name</strong>, separated by the <code>&#39;@&#39;</code> sign. Besides lowercase letters, the email may contain one or more <code>&#39;.&#39;</code> or <code>&#39;+&#39;</code>.</p>\n\n<ul>\n\t<li>For example, in <code>&quot;alice@leetcode.com&quot;</code>, <code>&quot;alice&quot;</code> is the <strong>local name</strong>, and <code>&quot;leetcode.com&quot;</code> is the <strong>domain name</strong>.</li>\n</ul>\n\n<p>If you add periods <code>&#39;.&#39;</code> between some characters in the <strong>local name</strong> part of an email address, mail sent there will be forwarded to the same address without dots in the local name. Note that this rule <strong>does not apply</strong> to <strong>domain names</strong>.</p>\n\n<ul>\n\t<li>For example, <code>&quot;alice.z@leetcode.com&quot;</code> and <code>&quot;alicez@leetcode.com&quot;</code> forward to the same email address.</li>\n</ul>\n\n<p>If you add a plus <code>&#39;+&#39;</code> in the <strong>local name</strong>, everything after the first plus sign <strong>will be ignored</strong>. This allows certain emails to be filtered. Note that this rule <strong>does not apply</strong> to <strong>domain names</strong>.</p>\n\n<ul>\n\t<li>For example, <code>&quot;m.y+name@email.com&quot;</code> will be forwarded to <code>&quot;my@email.com&quot;</code>.</li>\n</ul>\n\n<p>It is possible to use both of these rules at the same time.</p>\n\n<p>Given an array of strings <code>emails</code> where we send one email to each <code>emails[i]</code>, return <em>the number of different addresses that actually receive mails</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> emails = [&quot;test.email+alex@leetcode.com&quot;,&quot;test.e.mail+bob.cathy@leetcode.com&quot;,&quot;testemail+david@lee.tcode.com&quot;]\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> &quot;testemail@leetcode.com&quot; and &quot;testemail@lee.tcode.com&quot; actually receive mails.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> emails = [&quot;a@leetcode.com&quot;,&quot;b@leetcode.com&quot;,&quot;c@leetcode.com&quot;]\n<strong>Output:</strong> 3\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= emails.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= emails[i].length &lt;= 100</code></li>\n\t<li><code>emails[i]</code> consist of lowercase English letters, <code>&#39;+&#39;</code>, <code>&#39;.&#39;</code> and <code>&#39;@&#39;</code>.</li>\n\t<li>Each <code>emails[i]</code> contains exactly one <code>&#39;@&#39;</code> character.</li>\n\t<li>All local and domain names are non-empty.</li>\n\t<li>Local names do not start with a <code>&#39;+&#39;</code> character.</li>\n\t<li>Domain names end with the <code>&quot;.com&quot;</code> suffix.</li>\n</ul>\n",
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