leetcode-problemset/leetcode-cn/originData/first-unique-character-in-a-string.json

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        "question": {
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            "categoryTitle": "Algorithms",
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            "title": "First Unique Character in a String",
            "titleSlug": "first-unique-character-in-a-string",
            "content": "<p>Given a string <code>s</code>, find the <strong>first</strong> non-repeating character in it and return its index. If it <strong>does not</strong> exist, return <code>-1</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;leetcode&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The character <code>&#39;l&#39;</code> at index 0 is the first character that does not occur at any other index.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;loveleetcode&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;aabb&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">-1</span></p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>s</code> consists of only lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "字符串中的第一个唯一字符",
            "translatedContent": "<p>给定一个字符串&nbsp;<code>s</code>&nbsp;，找到 <em>它的第一个不重复的字符，并返回它的索引</em> 。如果不存在，则返回 <code>-1</code>&nbsp;。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入:</strong> s = \"leetcode\"\n<strong>输出:</strong> 0\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong> s = \"loveleetcode\"\n<strong>输出:</strong> 2\n</pre>\n\n<p><strong>示例 3:</strong></p>\n\n<pre>\n<strong>输入:</strong> s = \"aabb\"\n<strong>输出:</strong> -1\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>s</code>&nbsp;只包含小写字母</li>\n</ul>\n",
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