leetcode-problemset/leetcode-cn/originData/kth-distinct-string-in-an-array.json

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            "title": "Kth Distinct String in an Array",
            "titleSlug": "kth-distinct-string-in-an-array",
            "content": "<p>A <strong>distinct string</strong> is a string that is present only <strong>once</strong> in an array.</p>\n\n<p>Given an array of strings <code>arr</code>, and an integer <code>k</code>, return <em>the </em><code>k<sup>th</sup></code><em> <strong>distinct string</strong> present in </em><code>arr</code>. If there are <strong>fewer</strong> than <code>k</code> distinct strings, return <em>an <strong>empty string </strong></em><code>&quot;&quot;</code>.</p>\n\n<p>Note that the strings are considered in the <strong>order in which they appear</strong> in the array.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [&quot;d&quot;,&quot;b&quot;,&quot;c&quot;,&quot;b&quot;,&quot;c&quot;,&quot;a&quot;], k = 2\n<strong>Output:</strong> &quot;a&quot;\n<strong>Explanation:</strong>\nThe only distinct strings in arr are &quot;d&quot; and &quot;a&quot;.\n&quot;d&quot; appears 1<sup>st</sup>, so it is the 1<sup>st</sup> distinct string.\n&quot;a&quot; appears 2<sup>nd</sup>, so it is the 2<sup>nd</sup> distinct string.\nSince k == 2, &quot;a&quot; is returned. \n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [&quot;aaa&quot;,&quot;aa&quot;,&quot;a&quot;], k = 1\n<strong>Output:</strong> &quot;aaa&quot;\n<strong>Explanation:</strong>\nAll strings in arr are distinct, so the 1<sup>st</sup> string &quot;aaa&quot; is returned.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [&quot;a&quot;,&quot;b&quot;,&quot;a&quot;], k = 3\n<strong>Output:</strong> &quot;&quot;\n<strong>Explanation:</strong>\nThe only distinct string is &quot;b&quot;. Since there are fewer than 3 distinct strings, we return an empty string &quot;&quot;.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= k &lt;= arr.length &lt;= 1000</code></li>\n\t<li><code>1 &lt;= arr[i].length &lt;= 5</code></li>\n\t<li><code>arr[i]</code> consists of lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "数组中第 K 个独一无二的字符串",
            "translatedContent": "<p><strong>独一无二的字符串</strong>&nbsp;指的是在一个数组中只出现过 <strong>一次</strong>&nbsp;的字符串。</p>\n\n<p>给你一个字符串数组&nbsp;<code>arr</code>&nbsp;和一个整数&nbsp;<code>k</code>&nbsp;，请你返回&nbsp;<code>arr</code>&nbsp;中第&nbsp;<code>k</code>&nbsp;个&nbsp;<strong>独一无二的字符串</strong>&nbsp;。如果&nbsp;<strong>少于</strong>&nbsp;<code>k</code>&nbsp;个独一无二的字符串，那么返回&nbsp;<strong>空字符串</strong>&nbsp;<code>\"\"</code>&nbsp;。</p>\n\n<p>注意，按照字符串在原数组中的 <strong>顺序</strong>&nbsp;找到第 <code>k</code>&nbsp;个独一无二字符串。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre><b>输入：</b>arr = [\"d\",\"b\",\"c\",\"b\",\"c\",\"a\"], k = 2\n<b>输出：</b>\"a\"\n<strong>解释：</strong>\narr 中独一无二字符串包括 \"d\" 和 \"a\"<code>&nbsp;。</code>\n\"d\" 首先出现，所以它是第 1 个独一无二字符串。\n\"a\" 第二个出现，所以它是 2 个独一无二字符串。\n由于 k == 2 ，返回 \"a\" 。\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre><b>输入：</b>arr = [\"aaa\",\"aa\",\"a\"], k = 1\n<b>输出：</b>\"aaa\"\n<strong>解释：</strong>\narr 中所有字符串都是独一无二的，所以返回第 1 个字符串 \"aaa\" 。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><b>输入：</b>arr = [\"a\",\"b\",\"a\"], k = 3\n<b>输出：</b>\"\"\n<strong>解释：</strong>\n唯一一个独一无二字符串是 \"b\" 。由于少于 3 个独一无二字符串，我们返回空字符串 \"\" 。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= k &lt;= arr.length &lt;= 1000</code></li>\n\t<li><code>1 &lt;= arr[i].length &lt;= 5</code></li>\n\t<li><code>arr[i]</code>&nbsp;只包含小写英文字母。</li>\n</ul>\n",
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